RE: Any Cellpro 4s Charger users here?
I wouldn't just go charging every lipo at 2c or 3c just because the charger has an option to do so. You may not notice any problems with your packs right off and you may not burn anything up but you could shorten their lives. I can't say i've tested it but most manufacturers don't reccomend charging over 1c for a reason (in this litigous society I'd assume that reason as not being sued when you burn your house down or worse).
I charge my AT packs at 2c but they are capable of it. If they were some cheap packs I didn't care about I might risk it if I watched them charge but on pricy lipos I won't bother as I'd prefer longevity of the pack.