i have a zippy 5s1p 5000mah and i am impressed. the c rating of the zippy was the factor that pushed me towards the zippy. i actually asked this same question months ago and zippy was what people seemed to lean towards.one question are the avail again i had to wait 2 months for mine, luckily the mmm was back ordered too so everything i buy seems to be back ordered, wow now that i think about it my medusa was back ordered too lol
good luck