I have a pair of the exact same batteries that I use in my Goblin 770 and Agile 7.2. Mine are about 6 months old and perhaps 40-50 cycles. So far they are doing fine, no puffing and the cells all balance nicely. They are a slightly unusual shape, a little narrower but slightly taller and a shade longer than most packs of the same capacity. They fit the Goblin and Agile fine.
As for the C rating, I don't really believe any battery is genuinely 60C rated. All I can say is that so far they perform fine for all that I can throw at them without excessive voltage sag, but I'm not the hardest of flyers by any stretch.