for me personally, the nano's were very good packs when they were new. but they quickly lost their punch. after 30-40 cycles i bought an SMC for the first time and difference was night and day. it literally felt like a one or two pinion tooth difference. i'm at least that many cycles deep into my SMC's and there is no noticeable drop off in punch. i can't understand why anyone would buy a nano when danny sells these packs at the prices he does.