I have a 50watt charger (Dynamite Passport Ultralite) and was balance charging the GForce 25C 5000mAh in 55min when new and then run for 40-50min in my souped-up 2WD Slash. Kept track of the number of charges. Now at 30 charges & never running the battery lower than 3.72v per cell, it now takes 90min to charge and I only get 25min run time. I also noticed that the 25c doesn't have the oomph that my 65c has... a very noticeable difference.
Time to try the Elite Series now... The 40c 6500mAh. When I get 30 charge/runs on that, I'll write another review.