Perhaps powder-coating has come a long way since I last used it, but my
experience was mixed at best.  I powder coated my off-road race car's frame
and my Husqvarna's frame and although they looked wonderful (at first) after
a bit of use I started noticing spots where the powder coating was chipping
off.  Seems that everytime a rock bounced off the frame, a nice chip was
taken out of the powder coating, which, I guess, was understandable.  The
down side was that you can't really touch-up the powder-coated frame.  It
ended up looking awful after about two years.  Kind of like a frame with
freckles.  Still, it does look really nice when new.

Cheers,

Jeff