[T-Mobile Samsung Galaxy S 5] fzammetti:
TL;DR Recent family Sprint convert and so far we couldn't be happier with the S5 and TM!

I just switched my whole family (me, wife and two kids) over to TM from Sprint... we'd actually been happy with Sprint for about 6 years, weird as that may sound, but they were now trying to force us to change plans and not give us any deals on upgrades and basically it was going to cost more to stay with them monthly and we wouldn't be able to get reasonably cheap upgrades like before... for the past few years, because my kids' phones were bought almost exactly a month after mine and my wife's, we'd go in once a year, swap our phones to the kids and me and the wife would get new ones... well, they said no dice to this now. Sure, we give up unlimited data (sort of- TM is technically "unlimited" if you don't count throttling) but as it happens, that's a total worth it tradeoff.

After looking at all the options, I could have gotten away a little cheaper with Verizon (surprisingly!), and AT&T wasn't going to be much different than Verizon, but TM made it a deal we couldn't refuse: pay the Sprint ETF's, everyone got S5's financed, and we actually walked out of the store with the phones, Otter Boxes for three of them (I keep my phones "naked") and we actually had a $16 CREDIT on our first bill :) Yep, no money out-of-pocket whatsoever!

So far, we're loving it... had a minor snafu getting one phone switched over, but that was fixed quick and easy... the S5 itself is of course fantastic, which is no surprise... but so far, for the first time ever we actually get GREAT cell reception in our house even without IP calling (which we do use though), and it's 4G no less! (of course we're on wi-fi to save data, but still, we could barely get a Sprint signal before let alone a strong 4G signal like now). I also love that we get Hotspot for no extra charge, unlike Sprint... call quality thus far has been fine, though we frankly only use about 20 minutes a month COMBINED talk time so it's really not important anyway... coverage seems no different than Sprint so far overall... 4G speeds have been very good, about on-par with Sprint, maybe a hair better even. We only got the 1Gb plan because in looking at the past year with Sprint, only my son and I have ever gone over that line, twice each, and only once was more than a hundred Mb over... so 1Gb should be fine 99% of the time... we'll take the throttling after that if need be but no overage concerns is sweet.

And, of course, I rooted all four phones (screw the warranty, JUMP includes the handset insurance anyway and even though that costs something it makes the warranty a moot point to me) and I wouldn't give up that freedom for anything, so Verizon was a non-starter anyway (which is a shame really because we have FiOS and Verizon home phone and it would have been nice to have one provider for it all)... gotta have my root for Greenify and the mod to make the SD card writable!

Yeah, absolutely nothing to complain about at this point. I suppose things could go south at some point... until I see the ETFs paid off and the first bill to make sure nothing got screwed up I'm a little concerned... but assuming no surprises with either of those things I think this has been the best decision we've ever made WRT cell service (we had previously been on Verizon years ago, and AT&T before that, so we have some experience with all of them).