No never used one. My local shop has a hand crank one for like $150 I was thinking of trying, if it works I'd spring for a powered one. I want to do a little more reaserch on them, i think i could make one.
I've heard this from some people as well, it kinda bugs me. I realize bag appeal is important, but too many people put too big of an importance on it. I had got a great deal awhile back on some brownish, kinda stringy looking weed( heavy sativa) that no one wanted to buy, but it was WAYYYY more powerful than the pretty green/orange haired buds he also had at the time. Most people wanted the better lookin stuff..