How is T-Mobile Service around the Lake?

[castlebreakfast]

Hi there, I am thinking about switching my phone plan to Metro, which uses T-Mobile's network, because of a deal they are having. Does anyone here have T-Mobile, and if so, how is the service around the lake (and in New Hampshire generally)? I'm thinking specifically about the northern part of the lake, as well as the White Mountains, but any part will do. How is data as well as talk/text? Thank you.