This gadget is amazing! I'm very pleased indeed with it and a lot of people who've seen me use it have now bought one of their own.
It's simple but extraordinarily effective and goes about its job with no fuss. You just plug the dongle in (no drivers are required) and you're unchained from your laptop. Left and right buttons page back and forth though your presentation. Down blacks out / restores the display and up works the built in laser pointer. That's about all you need when doing a presentation really.
It fits neatly and discreetly in the palm of your hand. Though the design looks a bit clunky it's actually very well thought out from an ergonomic point of view. Very easy to use without looking. The wireless range is also very good indeed, as is battery life.
I've tried it with Microsoft Office 2003, Open Office 3.0 on Windows XP and Open Office 3.0 on Linux. All worked perfectly.
The only additional feature that might be nice is the vibrating time alert that the Logitech wireless presenter has, but I can live without that quite happily.