I've used the HTC Hero for my last 50 or so caches, I don't have a standalone and have never seen the need for one.
It's a LOT better than my Nokia 6220 Classic, which was very good. The GPS is brilliant and the big screen helps enormously.
Only main gripe is software availability. Geobeagle is good, [reference to unauthorized application removed by moderator], but like most Android users I'm very excited about the prospect of the new Groundspeak app.
I recommend the HTC to anyone. It's the clever man's iphone.