A few ZVRS people came and gave a great presentation at Deaf Family Night several days ago. Impressive stuff, and it appears overall to be the best choice for me right now.
I'm getting the Z-340, and I will use the Z4 software on my Mac and iPhone also. Now just waiting for my hardware to arrive! I'm still kind of sad I couldn't get the Z20 for free, since I don't have a competitive VP to trade, but the Z340 looks pretty nice, and I like that I can take it on trips with me.