They're by far the least evil of the major carriers in the US.
Only for certain definitions of "evil". I've been with them for 7+ years and every year the service gets a little worse, the plan gets a little more expensive, and they offer fewer new phones that I actually want to purchase. Sure, their customer service is cheery and all, but they rarely actually accomplish anything.
Interesting. I've been with them a few years and just kept the plan I started with. They no longer offer this plan, but I haven't selected another and they haven't increased the price I've been paying.