Here in the Salt Lake City, UT area Cricket is at least as good as Sprint(this is in my opinion, one of Sprint's weaker markets). I don't have any dropped calls with Cricket, but my home, which is also a problem with Sprint. I never had a busy signal with Cricket and I think that it's a pretty good deal to get Unlimited Local Calling, 500 Long Distance minutes, which can also be used to Canada and Mexico, Caller ID, Call Waiting, Voicemail for $39.99.
There are a lot of people here that use Cricket, but even more people use Verizon here. Within the last 18 months, I have seen major increases in Cricket's coverage, filling in dead spots, adding lots and lots of cellsites. Now, their service is really good here in S.L.C. and it would not be a bad choice if you don't travel outside the Wasatch Front.