I personally used them in my robots and also did stress tests on them before putting them for sale. I have run them for 3 events with no issues. We do test everything in our own bots in combat before putting them on sale. I ran a pair of drills on 5S A123s.

Here is a recent 3rd party review.
http://servo.texterity.com/servo/201309/?folio=34#pg34

I have done tests @ 30A @ 50% duty cycle for 1.5min and 30A @ 100% duty cycle for 5min+, under controlled conditions.