Review on Black PERIMICE-720 Wireless Ergonomic Trackball Mouse With Adjustable Angle By Perixx - Boost Your Productivity by Kenny Noel

Bought for work use. Just started using it today, but so far it has been good.You can customize the dpi in the driver software, other reviews stated they had a problem with the hi low dpi switch on the bottom. This is not a problem for me as i never need to switch, but being able to customize dpi with an actual number is a huge bonus. If they made one of the top buttons programmable to switch dpi, it would make more sense than a hardware switch on the bottom.I am used to using a Ergo MX, and while this trackball is larger in the hand, and the ball itself does feel a little gritty in comparison, it still works great for me. If logitech would make a wired version of the mx, I would be all over it, as I'm not a fan of non replaceable batteries(the batt in my mx has never been a problem, it lasts a long time, but why not give us a wired option? ). I did pop the ball from my mx into this trackball, and it felt less gritty, but it's so little difference to me, that I feel it doesn't matter.The software also allows you to program buttons with keyboard keys, macros, and the like.Overall positive so far, and i expect this to last a least a few years with continuous daily use. I will update if that is not the case.