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I'm in the Trenton/Lawrenceville area and service is great. I've never had any service issues around here though.

At my mom's house in Barnegat I get NOTHING. I'd be happy if I even got one bar now(haven't been there with the iP5 yet).
 
i have one friend with tmobile who lives in the Linden area and he says its ok. however everytime i had tmobile years ago, it was horrible indoors. outdoor coverage was ok at best, nothing like att or verizon around NJ.
 
Monmouth Junction area: it's been a while, but last time I tried T-mobile, indoor coverage was zero. Online coverage maps haven't changed at all since the last time I tried.

It's a shame, because if the coverage were halfway decent in this area, I would totally switch.

My experience is that when the coverage maps say "Good," it's actually poor. And "Satisfactory" means pretty much nonexistent.
 
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