I'll just give my experience. I have the XERun 60A, 120A, and 150A ESC's. I also have 2 RX8's. I just got my RX8's back b/c they needed to be upgraded from the old 4 hole case to the new 3 hole case. They seem to be working just fine at this point. I sent them in for the upgrade b/c they were starting to act funny. If tekin didn't have such good customer service I would never consider sending them back. If these RX8's 'let the smoke out' I will not replace them w/ any more RX8's. My XERun's have been great and I love the little program box. XErun's seem to run sensorless motors better than the RX8's btw.