imo, the $40 glass-dome style vappy i had before i bought the voodoo worked just as well.
You just gotta let it warm up real good first, and dump the remainance out ASAP when it's done, or it will burn.
A little harder to use, yeah, but you could try one of those first, and see if you even like using one before you drop coin on the expensive one.
And the effect is really nice. It's the body buzz, without the grogginess. So it's not just 'another' contraption, it actually produces a different effect altogether.
And like i said, some people will miss the grogginess, because that's what they equate with being, um, lifted? But if you try it and you like it, then at least it's not a complete gamble when you buy yourself a nice one.