I started with the standard 510, enjoyed it, but yeah, the batteries are annoying. Got an ego-t shortly after (650) and the batteries are a dream in comparisson. Only have the A tanks, for me they are fine, provided I'm not carrying it in my pocket. Haven't had much luck carrying it tip or battery down. But for car and home it's great. I got drip tips and cartos last week and since playing with those i haven't used the tanks all week. But I think the variety is nice. I can drip, use different res cartos and tanks....all on the same batteries. If I ordered again right now I'd likely upgrade the ego batteries, but the so far two 650s do me fine given I have access to electricity most of the day.
Sucks about the smokes, but this does give you a reason to upgrade
