Pros: You don't have to worry about minutes.
Cons: No Blackberries.
Summary: We used to use AT&T GoPhones, but my use for business meant I was refilling substantially more than once a year. When I figured out I was paying AT&T more than $400 per year, getting unlimited service for $200 more didn't seem too bad.
We have a second GoPhone which is used substantially less and gets buy costing $100 per year. When that one needs to be renewed, we will get rid of it and add a second Metro-PCS line which will only cost another $20 more than the yearly cost of that GoPhone.
Since we don't travel much, the more limited coverage area is not an issue. Service in Los Angeles is quite good.
I have only needed customer service once, when I activated the phone. I had the distinct impression he was reading from a prepared text.
I got the Samsung SCHr450 phone, which, at $179 isn't cheap, works very well for voice, text, email, IM and browsing. Having a slide out QWERTY keyboard is very handy.