I have used a Logitech trackball for decades and I like this 1 the best (this was bought to replace the Ergo I already have). I have a decent sized bedroom with my computer and bed in opposite corners. The Ergo works from the bed :) to be fair it works on the computer side of the bed but not on the other side. The only thing that concerns me is the the long term battery life – when new (about 3 yrs ago) fully charged it would last the full 4 months plus, now its about a month and takes ages to recharge (can be used while charging). Given the price I would expect the battery to last a couple more years before starting to die. Bottom line – would still buy again :)