Personally, I was surprised by how much I enjoyed Mustang. It's certainly nothing groundbreaking and the code is still being fleshed out, but it was fast and enjoyable. It felt like a throwback to a Williams game like High Speed, but with a few modern Stern twists.
I had a blast on the wedgehead row. Geez!
Predator, for me, had it's good points and bad. It felt nice and tight, and there were some interesting shots. I keep coming back to the art as being the weak link in the Predator chain, though. The cab looks good, but the playfield and plastic art, to me, seems really amateurish. I'm also not totally sold on the whole black light thing. Just seems a bit tacked on. The dmd work on it was the star of the show.