i've got the a7, it's great. I have it in the bedroom, and use it for airplay and speakers for my aTV, so i don't have to use the crappy ones in the TV.
sound is great, very full sound, i don't normally crank it that loud, but the times i have turned it up, it fills the room nicely.
i like the fact that it turns itself off, it also turns itself on when it sees input on either source, and sets itself to that source.
the remote design sucks though, a bit hard to figure out which way it goes, there is a small divit in the bottom that your index finger sits in when you're holding it the right way, so you kinda have to pickit up, and move it around in your hands a bit to get it the right way.