Have had two of their 12v x 300ah batteries, in 24v battery bank, for almost 9 months now ... drives the whole house, up to 200a discharge, etc. Magnum 4024 inverter/charger ...
Excellent USA presence for shipping and service ... in the first month, one gave some grief with a faulty bms; never died outright, just a bit of pain to wake the bms back up at times, while their tech support and I exchanged troubleshooting emails. They paid to swap it out ... sent me a prepaid shipping label (I saved the really nice packing materials te batteries came in) ... when UPS showed it as picked up for shipping, they sent the replacement.
Both have been running fine ever since, at one cycle per day ...
Will probably buy two more for parallel setup, when I sort out the busbars and wiring for that ...
A-T is a great company, and really impressive batteries ... up to 400ah now, with 250a discharge!
Note that their batteries are sealed abs, and bms has no built-in monitoring capabilities (this is the case on my 300ah models). also no freezing/charge protection, but I sleep with mine (heated shed), so that wasn't a problem for us.