I never charged them over 4.2 V per cell and always put them in storage condition of 3,8 V per cell. Mine never were below 3,7 Volt at the end of the flight.
I've been flying these 3200MAh 4S batteries and while the first batch I had - 30C Black label- took me through 2015 without any signs of deterioration, they died during the first training in 2016, only weeks before the W.Ch.
My next batch -40C Platinum label- has been used during 2016 and 2017 and so far, still OK.
My main reason for using them is weight, these 4S packs are only 275 grams. No way I could get my CG right with any other batteries, besides, I wouldn't like any higher wingloading either.
Problem with the RC driven development is that batteries for a given capacity are getting heavier all the time.
Revolectrix is the pleasant exception here. Hopefully their 'redesigning' is not making them useless to me.