I have used the 4s 5000 mah cells, and they have been great. I notice you seem to get less expansion when using them hard. I think someone here did a pretty exhaustive study on them awhile back. Let me look around..
I have the 2s 6A. They work very very well. Electric is right they stay firmer when run hard and cooler for that matter. I really do like them and would recommend them too. Plus they can be charged at 5c no problem.
Have two 4S 5.0Ah packs. The voltage on one cell dropped to 2.5v after a hard run, but came back on the charger. Not sure if there is permanent damage. Will run again and test...more to come...jury is still out.
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