[crazyjr]

I have three quarks, two 125 and one 80 amp, all work great. If the Lipo's are fresh charged, you might get a slight cog, till some voltage drains off, usually about 5 minutes worth. I did run 6s without troubles once, due to a rain out of a bash and the batteries sat for about 4 or 5 days before use. Twisted off a 4 yr. old driveshaft that day, Scary power on that level. All my quarks are bone stock and no mods, I have one 125 on a Neu 1515/2.5d, the other on a 2250/10t, Both run reliabily without troubles. The 80 amp gets a regular dose of 5s with a Lehner 1200 XL basic, Its geared for 35 and barely gets above whatever outside temp is. Overall I am very satisfied with mine, and yes for anything over 3s you need a BEC. I prefer koolflight, A bit bulky compared to others, but very reliable