Out of the box, I was 100% working w/ no stuck balls or wolvie switch issues. However, sometime in the first night of play the features associated with the 8 driver board stopped working. Thankfully, none of them are strictly necessary for gameplay. (Nightcrawlers and color changing GI relays.)
I'll take the opportunity to mention that I've gotten exceptional support from Stern and also Trent at Tilt. Within 15 minutes of dropping an initial email, I'd heard from both of them and I had a call from Chas to verify the troubleshooting I'd done. The likely replacements are on the way. I'd encourage anyone having issues to make contact; I'm very impressed.