I have 2 vant 6s and so does my brother, both have been great.They were purchased through dirt cheap rc/ the barn floor. I had a issue with one of them that was my fault. I contacted them 1 month after the 6 month month warranty period. After a few e-mails and a few pics I had a new 6s vant 4800mah sent to my door. I don't know what else customer support could do. I am very happy with my vants and they look identical to my smc's. 1 of my smc's sometimes won't charge due to "invalid cell count" my charger says, Smc says that it's not warranted, I must of dropped it or bashed the vehicle too hard? I'll stick w/ VANT batteries, they are local for me NY and great customer support.