Can't stay, they've wasted too much time. I'm more of an Apple fan than a TMo fan. I'm on Long Island in NY and while most places have good service I get really weird spotty coverage in places where it just doesn't make sense. I'll randomly pull my phone out of my pocket and have no service.
Plus AT&T pricing is now really competitive with a much bigger data allowance than we'll use (10GB for 2 phones, 1 iPad) for $140/mo, it's about the same as what we pay w/TMo - maybe $10/mo which will be easily worth it if the CS team is at least responsive and the coverage is only slightly better. Having had an AT&T iPad before I know the coverage around here is great, so it was an easy decision for me after the pre order screw up.
TMo, call me when your carrier grows up.