Already a convert to cordless keyboard and mouse convenience, I found that the ease of use and flexibility were compromised by the voracious appetite of the rodent for AAA batteries! Discovering that Trust had brought out a rechargeable model, I hurriedly ordered one and was soon laying out the component parts of the AMI Mouse 250S. My initial disappointment at the European style mains connector (requiring of me an expedition to hunt out one of those "shaver" adaptors) was soon overcome by the new, streamlined, more ergonomic styling. This made my former rodent of choice suddenly appear cumbersome, heavy and difficult to use whereas the 250S seemed to fit my hand perfectly. In addition to the left and right buttons, a clickable wheel is provided for easy scrolling. Even more usefully two extra buttons (thumb and fourth-finger?) are located on the side, customisable (as is the wheel) via the supplied software. Recharging is achieved by slipping the rodent into a cradle when not in use. It is claimed that it should run for two weeks between charges, but why risk it when you have a tidy place to put your mouse after finishing your computer session? The other great thing about this mouse is the fact that (with all joking aside) it has no "balls". It is optical, and as such has none of the gubbins and gears that are such magnets for dust, fag ash and Toffee Crisp residue. Say goodbye to bent-paper-clip-mouse-cleaning misery! It works fine on any reflective surface (the desk is especially good) so you can throw out your decrepit Toy Story II mouse mat now! In summary, it seems technology has produced an instant benefit to human-computer interaction. This mouse really is a joy to use.