I'm jealous. I tried to upgrade to that plan the other night, but upgrades "sold out" in less than a minute. I was trying to get the link to my review to get the 500MB bonus and missed out.
Oh well. I still have a line with 4000 MB and another with 2750 MB.
Actually, their voice network is a little worse than Sprint's since they route calls through their servers to insert ads in outgoing calls. It adds a little bit of latency to the call. For me, it's fine. Latency is only at about a second which I can deal with, but some people claim it's more for them and unbearable.