No, not really. A PTG is nice to have, but with experience you can get a feel for paint thickness and correct accordingly. It's nice to have if you're going to chase deep scratches with sandpaper though.
I have used one in the past, but I don't personally own one. I might buy one next year as I'm looking at picking up a big contract from a body shop (and knowing the paintwork will be invaluable).
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