Thanks for Masta FPV made this Tattu 30A ESC review video. Tattu 30A Blheli-S DShot 2-5S ESC is an amazing product. These ESCs perform with no issues and do so very smoothly. Being that they engineered these from the ground up it's easy to see that their strict quality control was present just as in the rest of their products.

You can purchase these directly at:

USA:
http://www.genstattu.com/ta-esc-30a-4pcs.html

http://www.genstattu.com/ta-esc-30a-blheli-s.html

Europe:

http://www.gensace.de/tattu-esc-30a-blheli-s-2-5s-w-dshot-no-bec-prototype-1169.html
http://www.gensace.de/tattu-esc-30a-blheli-s-2-5s-w-dshot-no-bec-prototype.html