Very impressed with this pack. It took about 6 cycles of break in flights to get the IR rate down. Once the pack was broken in I was seeing 1 to 1.8 IR readings per cell on my Cell Pro Power Lab. I always charge it at 8AMPS at home and 14 AMPS at the field with no issues. I have had the pack for almost 3 months now. Probably like 80 cycles. Pack is still perfectly square with absolutely no swelling. Will definitely get another one. I use it in a Logo 400 (same size as a trex 500) and do mild 3D for an easy 6min at 2400 Headspeed.