well they obviously won't make absolute crap really potent,

But its just the effects don't make you as dopey and sleepy generally, you feel more fresh and awake and clear, its hard to explain but its certainly pleasant at the right times , like in the morning.
However I like to get sleep and mongy at night so I smoke joints then.

Another great thing about vaporizers is they taste how the weed smells, when you smoke it, it is nice, but tastes differantly to how it smells, whereas vapour tastes like your sucking on a bud