I have built 4 race quads and I have been using Tattu's on them since the beginning. They are tried and true so if you take good care of them, they will take good care of your quads. Remember to balance charge them on a regular basis. I use the 1300mAh 4s on my main when racing and the 1800mAh 4s 75c when just taking footage. My specs are as follows.

2x Alien 5" Frame 1x QAV250 1x Falcon X-frame
Lumenier 2206 2350kv
HQ 5/4/3 props