Frankly, yes.
I got a BT600 because I wanted bluetooth and loved the idea of being able to plug it in to charge when the batteries were weak.
In practice, however, my unit had absolutely horrible range, and was also a pain and a half to get it to kick in after sleeping the computer or turning the mouse off--sometimes it would just plain refuse to reconnect unless I turned it off and back on a half-dozen times and said nice things to it. I'd have blamed weak batteries, but it's obviously designed to work with rechargeables, and it was the same with the pair it shipped with and some better NiMH ones I tried.
Mine might have been faulty, but I eventually gave up and bought a MX revolution, which I love. I haven't used a VX Revolution to compare, but my guess is it would be a better mouse. Certainly, the ergonomics are better--the BT600 isn't uncomfortable, but it's also not particularly comfortable, and the scroll wheel is on the stiff side.
