Pros: The signal is super strong in the areas that are covered on the coverage map. They've largely expanded over the past 3 years, and still are. They offer the latest styles in phones. They won't affect your credit record.
Cons: You will almost never get a hold of a human being. I think it's in Metro's business plan to purposefully not speak directly to the customer, unless he/she is signing up for the first time, therefore if you have a service issue, make sure you opt for sales dept no matter what. the phones they offer are trendy, but basic in function... limited is a better word. The coverage area is mainly in a metropolitan area, It's worthless when traveling to southern, CA. Doesn't help build your credit score.
Summary: I've been using this service since Metro's best phone was the Audiovox CDM8500. That was the KRAZR K1M (which I have now) 4 years ago. The phones are cool but they don't have full unleashed potential! I've had 4 different phones since I started using METRO. The insurance is ok, but your better off dropping it in a glass of water, and lying saying: you dropped it in the toilet, than to report it lost or stolen, in order to receive a replacement. MetroPCS's latest and greatest phone, the KRAZR is supposedly a media powerhouse, yet it couldn't play mp3's through a set of Sony Bluetooth headphones that I bought. The handsfree feature works, but once I queue up the music, it plays through the speakerphone. I might as well carry around a ghetto-blaster on my shoulder if I want to broadcast my music to the world. What this tells me is that MetroPCS told Motorola to disable the A2DP feature on the K1M. I've heard reviews of people with Verizon, TMobile, or Cingular raving about how sweet it is to listen to music off their KRAZR, but I've yet to make it a personal music player. If my credit didn't stink, and if I were willing enough to guard my minutes from another service, I would've dumped Metro long time ago.