I agree that you didn’t overpay. I used to have a Triple Action, it’s a fun game with the spinning posts and chance for triple bonus. Your backglass looks much better than mine did. And, perhaps most importantly, you bought a hands-on education course in EM repair. The repair aspect itself can be a very satisfying part of the hobby.
I also agree that it’s a good idea to read through the EM section of Clay Harrell’s website pinrepair.com. After I went through the whole thing I was much better prepared to work on EMs.
Just beware, these things are highly addictive and they multiply like rabbits!