I have not had the good experience of the other posters.
My first packs were new 12/10 and lasted 65 cycles until the first low-voltage cutout in 9/12. Slight puffing.
My second set was new 11/11 and lasted only 31 cycles until the first low-voltage cutout in 3/13. No puffing. Stored over the winter in the fridge.
I claim that I have not abused them, but I'm sure some will chime in and tell me otherwise.
My 3 year old 200+ cycle Hyperions are weakening, but still getting me though a flight.
...so just take this as part of the survey.

A further thought is that our experiences with these 2+ year old versions are really not relevant. It appears that the ones soon to be arriving at F3AU are entirely new/different/improved.

Dan