Just set mine up my premium last night. The sparkly metallic red trim really looks nice. Its inspiring me to do a similar treatment in green to my creech right next to it.
I also had the ball getting stuck behind the pops. I will try and add some rubber back there as suggested.
Also after playing for an hours or so It lost one track of one of the balls. It looks like the one of the ball trough optos is flaky. It seems to be intermittently seeing the first ball in the trough. The connectors looked like they were one tight. If I go into diagnostics and gently poke the receiving LED with my finger I can see it toggle on and off on the DMD. Maybe a loose LED or bad solder connection to the LED?