I've used the PAS since December of 2004. I play full time and have used it for hundreds of gigs.
The system has worked well although 4 speakers went out in the top tower 6 months ago and Bose was very good about sending a replacement set very quickly. Unfortunately I damaged the base unit and found that to repair it would take 4-5 weeks for $250 or I could buy a refurb right away for $500. I'm not too happy about this and have written about it on the tech support part of this forum.
I play both electric and acoustic guitars and sing with backing tracks I run through a Minidisc player and a Mackie 1402.
Let me just say that in a small to mid size room the sound is as good as it gets. Very balanced. The main problem I find with the system is that it is not loud enough. Plenty of people have told me to turn it up. I normally run the mic channel at 1 o'clock and the master the same . In small rooms I can run things at 12 O'clock until it gets crowded.
I live in New Jersey and play mostly in restaurants. Maybe everyone else plays in venues where people sit with their hands folded and are listening to every note. For me the rooms I play in are filled with people talking and sometimes the PAS just isn't loud enough to cut through. My solution is to use it with my old PA speakers and a 1000 watt mosfet amp for big gigs. So much for reducing onstage clutter.
The other problem I encounter is that I'm often set up on the floor very close to a wall. In some places it's hard to get out in front of the system to hear it properly.
The other thing to keep in mind is that the system works best when there are some reflective surfaces to bounce the sound back to you. I played in one room that was heavily carpeted, acostical tile ceiling and couches and chairs. In that setting the sound was quite small.
The reverb issue is a problem for everyone I know that has used the unit. They tell you to try to sing without reverb. Whoever said this couldn't possibly be singing 35 to 40 songs a night. I just send a line out from my Mackie to the mic input on the base so I can use the aux send on my mixer for effects. I would like to bypass the mic pre on the PAS completely but I find my Beta 58 needs the digital mojo of the Bose preset to sound good.
Don't get me wrong. I think the PAS is a really cool design. It just needs some work,more power, better service, on board efx, maybe a powered sub instead of this seperate power amp affair they've come up with. Try before you buy. For me the honeymoon is over.