Gottlieb has a reputation of being built like a tank that is not really true. They are well built but my experience is they are much harder to keep dialed in than a Bally or Williams.

CCM is junk.

CCM made a lot of arcade games. They never seriously challenged in the pinball world.

To me their games were cheap and short on features.

I don't know that decagons are over built. What they are is overly complicated and fiddly. I used to hate rat traps but if you can work on them out of the game they're easier than decagons. Just get those switches adjusted before the circuit board goes in. If not you're screwed.