I love my AERs. I've used a single Compact 60 on its own for guitar+vox and it's fine; and I've used two with a Behringer mixer for pub open mics and they've been great. Used by many of the top guitarists, too. Eric Roche, Preston Reed being two I've seen/heard recently.

And they're small and light. I used them at a small out-door festival gig recently, and the duo who were going to follow me said "That's travelling light", but decided to use mine rather than reset with their own macho stuff.

Dunno about the new Roland - but I've had a bad report of them. I thought it sounded interesting, what with its automatic feedback-zapping circuitry (it finds the offending frequency and puts in a notch filter, I think) but the sound's not so good. Allegedly.