I cant find anything about the nano or superslim. Is the superslim small and vapes like a 510? I love that 510. The only two issues I have is topping off more often and battery life is only about an hour to 1 hour 20mins tops. So I end up taking my M401 to work because the battery life is a lot longer but topping off is a pain. Please let me know because I'll take a superslim. Just give me a month to save. I had to get my dog neutered and get my car a new motor mount and drive belts. Jeesh drive belts are expensive. Thanks guys for being so informative.