VZW -> TMo -> AT&T
My g/f and I have our phones together and we left Verizon a few months ago to save a few bucks and check out TMo, we had them take care of the ETFs and traded in some really old crappy phones and kept our iPhone 5s(es?)
Where we live (Long Island, NY), the coverage is spotty. I'd pull my phone out of my pocket and sometimes have 'No Service' at the top, and while driving using iTunes radio or Match, things would be going great then suddenly the music would cut out because I'd lose my connection.
We traveled abroad with TMo and liked the international coverage, however you are limited to 3G - at first it was kind of OK but after about 10 days I had enough of it, when I'm abroad again I'll go with a Vodaphone pre paid SIM and just pop it in (45 euro/mo I believe)
So we come back home and as soon as we land we planned to switch from TMo back to Verizon because we still weren't happy with the coverage, we let it slide a bit and kind of didn't care.
Then came the iPhone 6 pre order, where I stayed up all night to try and order, then had to stay up an extra 3 hours to call them on the phone, only to be pushed back and deal with some really really horrible customer service. Everyone there is absolutely clueless about it, from their Twitter/Facebook, regular phone people or executive office of the president people. No one was rude, they just had no idea.
At that point I canceled my order (it was actually intercepted during shipment to me) and we just ported our lines to AT&T this evening. At home the coverage is much better (1-2 bars vs AT&T's 4-5). I know from previous experience we shouldn't really get into a lot of those dead zones. (had an AT&T iPad 3rd gen)
I know AT&T will have more congestion and won't be as fast as TMo until probably some point in 2015 but I couldn't just keep giving TMo anymore money. The pre order experience combined with the spotty coverage drove me over the edge.
I hope that people still use them, I know they're driving the industry in a few ways (no data cap for popular music services, low prices, no contracts, no interest equipment financing, etc) and it's overall better for everyone, they just need to get their back end up to par and get some denser coverage in populated areas.
As far as pricing we'll be about $18 more / month for AT&T, 10GB data, unlimited talk & text, 2 iPhones, 1 iPad. (We each had I think 3GB on TMo that we never got close to using)