ive used it, and to me, on small projects it works great - for instance i used it on my bumper marker lights on my gto and the results were great. you really have to be patient and take your time. however, you still have to use a clear coat so it takes more time.
on larger projects, i think youd be better off having a body shop do it with a quality spray gun and black paint mixed in with clear. i just picked my tails up today from a shop here in tucson, and am a lot happier with the results using the black mixed with clear versus the vht on my gto.
heres some quick pics of the lights on my 08.