I've had an airboard since 99 (paid NINETY bucks for it) and I've tried the gyro wireless stuff and dell's wireless setup and the IR airboard actually works much better from a lazy boy/couch - the dell (logitech made, i think) had no range, and the gyro mouse kept getting lost in the couch. if you position the receiver correctly, the airboard works well even at 20+ feet.
not to mention i don't remember ever changing the batteries....
the key to it is to learn all the keyboard shortcuts for everything you can. the mouse nub thing works well, but it's all much easier to do with the keyboard. having the mouse there as a backup to the keyboard without having to find it is excellent. i've never used a trackball much, but the times i have i found it very poor as a mouse (worse than a nub by far.
the airboard also has a left click lock/unlock button on the front so dragging and dropping can be done one handed.