Congrats on the SOF (LIONMAN!!)
Have had mixed results ordering from classic. Some ok some poor quality. Personally I would shop around and order from them as a last resort.

Check around several threads on here
Here's a snippet from one...

I had to re-read that because I didn't remember writing it. Took me a sec to realize it was me quoting OBGO777. My experience with said product below:

I bought a cheap beater Whirlwind that was missing a bunch of inserts. I have hopes of finding a relatively decent price CPR repro so I didn't wanna do to much & wanted a playable game. I removed all of the Mylar, fixed what lifted inserts I could, applied Classic Arcades' adhesive decals & then just threw a Mylar playfield kit over top of them. It's better than it was but it's not perfect by any means.

The decals are pretty well made, nice embossed feeling texture. Much better than his drop target products. I'm not sure if they'd hold up in a high abuse setting so that's why I just got the mylar kit from Marco. The light bleeds through the black a bit, but for thirty bucks I can't complain. Everything lined up pretty well in the Whirlwind set, too. I guess the proper way to do it would be to print them yourself on water slide decal paper and apply them but I wanted a quick temporary fix. CA's decals satisfied me in that regard. Whirlwind with no compass decals isn't as fun!

My experience with Classic Arcades is that they are a so-so product at a so-so price. Better than nothing but not the best out there. I have not purchased their insert decals but I have purchased their hot stamped drop targets as well as their drop target decals. The decals were passable. I felt like going over the hot stamped ones with a sharpie to fill in all of the gaps in the lines.