I did once and they touched it up, got overspray on the rest of the car, and I ended up just sanding it myself and taking it to a body shop that a lot of guys reccomended to me. They removed all teh body filler on teh car and fixed/reformed every body panel by hand (this was on a 1964 Ford), They even created a new rear quarter panel (which has a pretty intricate design) all by hand, looks like brand new. The paint job on the car looks better than any brand new car i've ever seen on a lot.

that car is my show car, and has a lot of sentimental value (been in the family since new), so it was worth the $$$ to do it right.