I checked it out, but was surprised at the various startup costs, then the add-on of data if you use it. It costs $120 to get two basic phones with sims, activation, etc. Their phone selection sucks, but I suspect you can use any gsm phone you want. I did like the fact that the data was prepay for a big chunk, not a monthly fee.
Also, I've heard that you cannot have two phones with different area codes on the same plan, FYI. Amy and I have 214 and a 469, respectively.
edit: never mind - I'm thinking about Walmart Family Wireless.