I'm running 6 of the 40A X-Rotor ESC's on my Tarot T960 powering Foxtech 4016 KV380's. I picked them up in March and I have 30+ hours on them and I love them. They are very smooth, very responsive and haven't given me a second of concern. My Tarot hovers extremely stable and slow yaw pans are very stable. I have the ESC's out at the end of the arms and I soldered in 3 - 470uf 35VDC capacitors in parallel in front of the ESC's to condition the line voltage. They barely are warm after 14-16 minute flight times. IMHO they are very good ESC's and you don't have the hassles of flashing them to get the higher refresh rate needed by the A2 FC.
Bob