Guest Ken; I use the Bose system, using either one or two L1 Mk1 systems. I've used the Mk2, and it isn't as powerful as the Mk1, with less 'throw' for long venues. That said, the clarity at long distance is amazing. I use three subs with the two poles though; the bass does fall off quicker than the top. The Bose system really does do what it says; I played an outdoor gig doing background music for a charity run at a football stadium, and you could hear every word of the songs at the other side of the stadium. For bigger gigs (say 2 or 3 hundred people) I find you have to turn the Bose up really loud, and that gets uncomfortable for the musicians if you use the system as Bose recommend, i.e. behind the players. I usually put the system in front for these gigs, and use TC Helicon personal monitors. For anything bigger than that, it's Mackie time, with a pair of SA1232z's, at least 2k of sub power and the Bose rig as side fill monitors.
Agree with Treewind; a time delay box of some sort is a must if you are using satellite speakers down the hall.
Tim