For what it's worth, I'm in the NYC Metro Area (Northern NJ) and we've got LTE almost everywhere on our commute now except for a few minor exceptions on the way, not noticeable when we're streaming music because by the time we're out of the LTE area and into the 3G "garbage data" area we've built up enough buffer to get us out.
Before LTE was active I was strongly considering switching.
The reason we didn't go to T-Mobile was because I have talked to a few co-workers that live very nearby that basically told me if I go off the Garden State Parkway I won't get signal.
The reason we didn't go AT&T or Verizon was because we would have had to pick a data plan and it wouldn't be unlimited. And it would cost more.
So, with the LTE working, the Sprint service is "acceptable." We recently went on vacation to the Florida Keys, and half the keys had LTE coverage, half had around 1 bar of "3G Garbage Data" so we just planned accordingly.
We pay around $215 per month after all taxes and fees are said and done for 4 lines of service, with which we share 1500 minutes between the lines, have unlimited texting and data, and have free nights and weekends, and free mobile-to-any-carrier-mobile calls. I think over the last 4 years the most minutes we've ever used as a plan is around 600.
I briefly looked at VZ and AT&T prior to the 5S launch and I found that I would be paying roughly $30-$40 more per month for service. I could get it comparable to what I pay now but I would be only allotted 4 GB of data per month shared between each of us... I think we need a little bit more cushion than that.