I brought this product when it first came out and 10 years later it still sits in my hand. I have used it for every game under the sun, designing? everyday use, travel and pc matinence tasks down to using in dos windows kernel for reformatting there is absolutely no problem with compatability. The sensity is still amazingly awsome against today's mouses at 1400 Dpi your every movement is sensitive. I did grow up wrist gaming and yes i did find it hard to adapt for about a week i have never regretted buying the ball ever. For every task this excels beyond any wrist alternative can offer. With proper training your thumb can be the master, it is kinda a console gamers alternative but its a ball not a stick so much possibility is there its unreal. The harder techniques take time but im happy to say i thank ££ earnt in gaming from the trackball. Even at this high price today id recommend this, to clean it lol all you do is place a vaccume cleaner hose after taking the ball out over the hole and it will remove all debris. my device has been threw lots i mean lots puberty for example it got thrown all over the gaff. its not got one ball =/ sigh wish i knew the size dont throw it hard, but still even without 1 ballbearing and just offset on the ball i can still use it fine. Since i got this i have brought this for 2 friends in the USA just before it stopped, £45 rrp xmas prezzys for clan mates they both have not gamed on anything since. You might think im hyping this abit much but i find it hard to put in words 10 years of absolute gameing glory. The mouse is currently not being manufactured from Microsoft and the demand is very high. The price will only go up get it now i promise you after a month and some Black and White (Lionhead) you wont regret your purchase. If you have problems with this its not the device its your thumb and id go to the doctors tbh...