Make the jump NAO!!
They pay your ETF, there service is only getting better and stronger since they bought spectrum from Verizon, tons of roms with very easy root methods(one doesn't even trigger knox if you don't care about flashing roms and kernels) but yes tons and tons of custom rom and kernel options over here on T-Mobile.
You guys do have Beanstown(love his jellybeans rom to death) scrosler(cleanrom) hashcode(insanely smart dev that helped create safestrap(or he did it all by himself apologies if I'm wrong) that I'm sure you'll miss but there's still ways to flash your carriers rom as well as the international n9005 roms with the wifi nfc blue tooth. Zip fix.
I really did my research when considering which carrier I got my note 3 from, hated sprints network on the note2,verizon was too expensive and locked down bootloader unless you bought the dev edition which cost more too, then att was no better with its subpar service and locked down bootloader. To hell with all them!!!,
T-Mobile has always been my favorite cell phone provider and their service has always been great(love their free wifi calling) there always doing their best to throw out great deals to get you to join. I still prefer and always will just buy my phone exchange outright and pay anywhere from 30 dollars a month for unlimited data, text and 100 minutes anytime talk, or if I'm needing it just pay the measly extra 20 for unlimited talk text data and 4g Lte.
Sent from my SM-N900T using xda premium