Coverage in Phildelphia/South Jersey?

[fedxup]

I'm thinking of switching to TMO in the next month or so. I've looked at the coverage maps and it looks just as good as what I have on ATT, but wanted to get some actual user feedback. I live and work in the Main Line area and head to the shore a lot in the summer. Should I be concerned about coverage at all? I will be adding 2 more lines and more data to the 3 lines and 15GB that I already have with ATT and my plan with them is going to way too expensive. Definitely want to save money, but not sacrifice coverage.