Benutze sie schon einige Wochen und bin sehr zufrieden.

Works well. Have been using these for several years now. Haven't had any wrist pain after switching to trackball

Al principio me contó adaptarme a el, me dolían los ligamentos, pero supongo que es el cambió de un mouse que se mueve a uno estático, solo me puse almohadillas en los codos y le pongo una goma abajo (Dándole así una elevación en la parte de mi dedo meñique, a veces me duele ese dedo) y afortunadamente eso ah sido la solución para poder trabajar 8 horas seguidas.

Produto que confirma a ótima reputação da Logitech. Ótimo acabamento. A adaptação ao "jeito de ser" de um mouse trackball ergonômico foi muito tranquila, pois o uso da bolinha é bem intuitivo e natural. Para trabalhos que requeiram muita precisão, talvez não seja o mais adequado, mas para uso em planilhas, editores de texto, navegação na internet, e processamento básico de fotos e vídeos dá conta sem restriçõesNão testei a conexão via BT, utilizo apenas a via USB, que funciona sem falhas.Mini manual que acompanha o produto é essencialmente inútil e não fala NADA sobre a limpeza da bola, que talvez seja o detalhe mais diferente em relação a um mouse tradicional, mas não faltam vídeos na internet explicando como fazer. Recomendo!

Very convenient to use

So I've been using Logitech thumb-based trackballs since they were rectangular and connected with a DE-9 serial connection. I swear by them and have converted many others.The advantages are clear: you don't need huge swaths of desk space to move them around, you can remove your thumb from the ball so you don't inadvertently move the cursor when you click, and the interface is extremely intuitive and easy to use. The biggest disadvantage is that they are solely right-handed -- my two lefty kids can't use them. The kids also say they're not great for gaming so that might be a factor; my youngest uses some specialty mouse designed specifically for gaming.As for this particular model, it's not terribly different from the previous M570. Note: in the pictures, the new M575 has the more silver ball; the one with the more blue ball is an M570.The forward/backward buttons (between the left mouse button and the trackball) are less prominent on the newer model and include indentations that appear to be simple circles. I'm guessing that the circles are meant to give your finger a reference point to be able to click without looking but I find them more annoying than useful (they feel like there's a piece of dirt or something stuck to them) and the prominent buttons of the M570 were easier to feel, as well as being less susceptible to accidental clicks.The palmrest part of new M575 as some subtle ribbing, probably meant to keep your hand from slipping from side to side but it's honestly just another annoyance. Not enough to prevent me from using it but given the choice, I would prefer it without.The activity light/battery warning light has moved from just behind the forward/back buttons to the middle behind the main mouse buttons. Not a problem at all, just different. I will note that the light on the M570 can be seen even when your hand is on the trackball whereas this one is covered up by your hand.The trackball itself is fine; I think I like the old blue color better but there doesn't seem to be any other difference.The bottom of the trackball is not functionally different from the old version and it's good to see that the slot is still there in the battery compartment to hold the receiver. The power switch is a little smaller and harder to access but still perfectly functional. There is a new button that appears to switch the trackball from using the receiver to using bluetooth -- a handy feature if you want to use it with something like a tablet, I suppose. (I've not tried it via bluetooth.)If you're thinking about upgrading from an older M570, you'll feel right at home, for the most part, but I don't think there's any compelling reason to rush right out and get one. I bought a new one because the scroll wheel on my old one stopped working reliably. Had it not, I'd still be using the M570. (Note: I still use an M570 in my office, as does my wife.)If you're new to this style of trackball, imagine laying your hand on a gently curved rest and moving your thumb around. It's comfortable and less stressful than a traditional mouse and it requires a lot less free desk space. It doesn't need any particular type of surface; I've used it with it on my leg, on the bus seat next to me, and on my bed.It's not the cheapest device in the world but if you're hesitant to spend $50 on a trackball, you're probably not a heavy or serious user. Gamers will probably look elsewhere and possibly even pay more; casual users will be looking for something in the $15-25 range. I'm in front of a computer 8-12 hours per day and I don't mind spending a bit on something to make that experience more efficient and more comfortable. If you want to try a trackball without spending as much, there are some decent knock-offs on Amazon that should be fine. But if you don't mind investing in something like this, it's well worth it.

Bin sehr zufrieden.