I just got the new Kensington PocketMouse Bluetooth Optical on Tuesday. I'd been holding out for a Kensington. It has two buttons plus a (clickable) scrollwheel. In general I really like it and Kensington has great (optional) software. Setup was a breeze. One possible shortcoming is it doesn't have a power switch. I can't say whether or not the lack of a power switch is really a significant thing, though, since I only just got it and can't comment on battery life. It uses 2 AA batteries (included). It is a bit on the small side, smaller than the PocketMouse Pro Wireless, but I find it pretty comfortable to use anyway. YMMV, of course. Currently I'm using it with my PowerBook 667 MHz (VGA) and a D-Link DWB-120M USB bluetooth module, which is not the newer, but the older one. Apple only recommends/supports the newer D-Link with their mouse/keyboard and there are definitely some issues with this bluetooth module - for example Salling Clicker doesn't work if encryption is enabled - so it would not surprise me if the problems I'm going to note aren't there with newer bluetooth modules and/or Macs with built-in bluetooth. I should be getting a new(er) PowerBook with built-in bluetooth sometime soon and will find out then. Anyway... ...it takes a substantial amount of time for the Mouse to start working after waking from sleep. On the order of 30 seconds, but I haven't timed it. Sometimes I see a "Connection Lost" message when first waking from sleep, other times I don't see that. For a second or two when it initially starts working the mouse seems to move like it's drunk, but then that clears up. Weird. Also, when booting up the computer the mouse does not work until I log in, then the mouse is found and starts working. Once you get past these hiccups the mouse performs beautifully - it tracks and responds like a wired mouse, much better than the PocketMouse Pro Wireless. Kensington's MouseWorks version 2.5.x software supports bluetooth mice and is excellent as always. I'm told by Kensington that they will soon have a full size bluetooth mouse (based on the PilotMouse line) as well. Steve