Hi Fran,The Evo in my opinion gives a much better throat hit than the 901 and vapor for that matter, atleast to me or the maybye its the one i own.I personally love the thing, i recently bought a 901 and im kinda the opposite of you, i wish it was the 901 i didnt order.I mean its not bad, its ok, easier to top off with liquid thats true, but vapor and throat hit the evo outperforms it every time..I think you got a bad one or something dude to be honest, but anyway good luck and i hope you get it settled with them!