Some screenshots of the software application and other stuff:
A summary of things I've noticed so far:
PROS
~ Great range & reception (worked from 10m away through a couple walls!).
~ No wireless lag that I could notice.
~ Ridiculously easy to set up.
~ Can be used in an XP x64 environment! (not tested on Vista x64)
~ Compatible with ALL Xbox 360 wireless accessories (though I have only tested control pads).
~ Headset can be configured with Voice chat programs like TeamSpeak (see House's
post).
CONS
~ Force Feedback does not work (as of the latest driver/program release).
~ Possible problems with some button assignments (see kidkhaos'
post). Although I have not had any such issues.
ISSUES
~ Have to resycn controller to X360/PC every time you swap between them (i.e. control pad can only be linked with one device at a time).
~ No way to manually power off control pads (have to physically detach battery, or wait 10 minutes for auto shut-off).
~ Need to unplug your Xbox at the mains everytime you re-sync to your PC, otherwise pressing the Guide button will turn your X360 on

~ USB sync issues, rather annoying! Detailed thread
here. My personal experience is detailed
here.
Will keep this updated with any other bits I discover... hope it is useful to everyone
Cheers,
Suman