Nulea Wireless Ergonomic Trackball Mouse, Rechargeable, Bluetooth Rollerball Mouse, 44mm Index Finger Trackball, 5 Adjustable DPI, Compatible with PC, Laptop, MacCarbonfree Certified

I was looking for an alternative to the Logitech Marble, production of which has unfortunately ceased. I've tried the models with the ball that can be controlled with the thumb: a horror. I also tried the Kensington Orbit, which is the closest, but the construction is light and not at all practical. The Nulea is certainly the closest model from an ergonomic point of view, with the ability to scroll that didn't exist on the Marble. The mouse may be a little too small for me (I have very large hands), but comfort and usability are close to perfection. My mouse was recognized without a hitch under Windows 10 and MacOS Sequoia, in BT and with the dongle. The battery has good endurance, the mouse goes to sleep and wakes up very quickly with a click. The feel is very soft, the workmanship gives confidence (much better than the Kensington!), the ball can be removed and is better anchored than on the Logitech. You have to push it out from behind.

I ordered this Nulea Trackball with finger control and found it to be the most comfortable trackball mouse I've ever used. I've been using them for at least 35 years, but I don't really remember when I started; I have never returned to a "push it around" mouse. Needless to say, I've had many versions of trackballs. Though it does not have programmable buttons, this one does exactly what I want it to do, just like a proper mouse should. Highlight came when the mouse developed a scrolling problem, but with a message to the company, it was quickly replaced without a problem. It was nice to see the company actually stand by its guarantee.

Amazing mouse!!! it's a miracle. I was having some pain after 5pm daily but with this mouse I no longer have the pain!!! I got the cortisone shot for my shoulder before i bought this new mouse, so i thought let's try new mouse! it's amazing how the stationary mouse helped me so much!! HIGHLY recommend the new design model since the new model has palm rest design so it's even more ergo than the older model!! thank you!!!

The Nulea M505 clearly took "inspiration" from the Sanwa Gravi finger ball -- word on the street is they are made in the same factory to similar specs -- yet there is enough small changes to make them different. And I think that's exactly the point, to make them different.Tl;dr: ergonomic contour mostly the same (which is good), physical buttons arranged differently and with different characteristics (slightly worse than the Gravi for my own use but may be preferable for other people)In terms of overall shape and contour, the Nulea M505 and the Sanwa Gravi are almost identical -- the only, superficial, difference being the front on the Nulea is more rounded. You'll never feel (or even see) that while using it. This similarity is a good thing, because IMO Sanwa Gravi is the first trackball in the last decade to actually nail the ergonomics of palm contour (more details on my longer review on the Sanwa Gravi page).The physical buttons on the M505 _are_ arranged differently and have different characteristics. It used the more traditional arrangement where on the thumb cluster you get left button, wheel, forward, and backward. The right button is moved to the right of the ball under the ring/pinky finger. On the Gravi, you would have the right button taking the place of the forward _and_ the backward buttons, and have forward and backward as two big(ger) buttons under ring and pinky. I slightly prefer the arrangement on the M505 because it's more in line with other finger balls and is therefore more intuitive.A big difference in terms of implementation, however, is that the left button on the M505 is slightly recessed from the casing. For people with longer thumb (like myself), this may be a problem because you'll have to curl up your thumb a bit to engage the left click -- or rotate the trackball body clockwise so your thumb lands closer to the rear end. In my opinion, neither solution is ideal because this is unnecessary restriction on ergonomics. As a comparison, the left button on the Gravi is slightly _raised_ from the casing, making it more comfortable to engage with any part of your thumb (even the joint, if you like). This may be the most serious issue people should consider when choosing between the two.Another difference, not as big but still could be significant, is that on the M505, the upper edge of the left button sits lower than on the Gravi. This is because on the M505, the wheel is implemented as blocking off a whole stripe of real estate on the thumb cluster (the left button does not share any edge with the back/forward combo). On the Gravi, the left and the right buttons (the right taking the place of the back/forward on the M505) share a horizontal edge, and the wheel is implemented as a thin cutout on their shared edge. What this means in practice, is that on the Gravi, you can engage the left button on a vertically higher position (near the edge it shares with the right button), which is closer to your palm, and so requires less of a clawing gesture for left click than on the M505. I'm not sure whether or not this may lead to more stress on the thumb long term.A side effect of having the back/forward on the M505 on the thumb is that the back button is more difficult to reach. Clearly not enough thought was given when the decision was made to simply split the right button on the Gravi into two equal halves of back and forward on the M505. In my opinion both buttons should be moved more toward the front.Yet another difference: on the M505, middle click can be activated by tilting the wheel downward. On the Gravi, it is activated by flipping the wheel upward. I don't have a preference one way or another but would note that both are more ergonomic than on a typical wheel where you'll need to press inward and could accidentally trigger a scroll event.The ball movement is appreciably smoother than the Gravi out of the box. Combining with the fact that it's also easier to remove the ball from the M505, I would guess they reduced the height of the bearings slightly.The placement and labeling of the dpi/connectivity switches on the bottom is significantly better on the M505 than on the Gravi (The latter has the most illogical arrangement I've ever seen, and with no labeling whatsoever on 2 out of the 3 switches)All things considered, I think the M505 is a very decent finger ball. My main beef with it is the recessed left button, which to me is a not-insignificant ergonomic regression, and to a lesser degree the wasted real estate around the wheel, which could have been used for a more ergonomic left button. But these may not be much of an issue without comparison to the Gravi. The price point of the M505 -- being close to half of that of the Gravi -- is certainly much more reasonable.

Super easy to install, works GREAT! Buttons feel strong, but also are sensitive. Trackball is GREAT, perfect size and orientation IMO. Buttons where they ought to be and the wheel is perfect, too. LOVE that it's rechargeable!! Great price, too.

I like how it fits my hand. The mouse fit my hand perfectly and the buttons were in the right places.. There are lots of switched for setting but the default was all I needed. Yes, when the computer is asleep and the mouse is in battery saver mode it takes a couple second to reconnect, but two second I have. No big deal.