First, latency comes in at about 20ms, according to both the specs and my measurements. What does that mean? It's just fine for most applications, but if you're super exacting about sound, this probably isn't a good option for rear speakers (but certainly no worse than any other wireless option out there).
Second question: How many AW1 units can be used simultaneously? I've emailed Brady and I'll post the answer RIGHT HERE, and in The Real HT Info Blog, as soon as I find out.
Update from Brady: We don't have any formal documentation yet (forever working on a whitepaper), but we're recommending no more than 4 Sender/Receiver pairs running at the same time. Also, it's best if Senders are kept a minimum of 4-6" apart if plugged into the same power strip or powered USB hub.
I'm Going Minimalist. Look at this...see those big bookcases full of CDs. I'm going to rip those to FLAC and build some Bass Traps. Don't worry, I'll video everything long the way.
Sound in Film: Foley Artists at Work
You know that "Sproing" in Bourne Ultimatum? It didn't get there by accident.