I'm flying a Vulcan UAV 850mm QUAD un the U7 490 with 80amp T-motor ESC's and it's awesome. Running an A2. The ESC's get HOT, but I was told by T-Motor that this is expected, that the ESC's have a heatsink built into them. Both the motors and ESC's land hot on the quad with an AUW of 19lbs. I'm also running an X8 with U5's and the 45amp T-Motor ESC's and it comes down rather Hot as well at only 21 lbs. One of my other rigs has Avroto 3520's and Maytech 65amp ESC's and at 22lbs comes down cold to the touch!