I have only had their older 4000 10c cells, but they perform as well or better than the maxamps 20c 4000 cells. I would not hesitate to recommend True RC to anyone, based on my experience, and the experience of others here on this forum.
Im running a true-rc 5s 8000mah without a single issue great price fast shipping and I put it right on par with maxamps at way less cost.
I also use a true-rc 900mah in my e-flight chopper no issues there either I recomend them.