Dialed in was my favorite all around. The most polished and fun for my tastes.
Alien was great, but needs a little more polish. For example, the Alien head ball grabber wasn't working as planned.
Aerosmith was yet another hit out of the park by Borg/Stern. It's really fun to play. I'm not much of an Aerosmith fan so there are only 2 songs on there I would have to choose ad nauseum. My only criticism of it is that the songs are painted into the playfield, so switching them in pinball browser will be a little more out of place than a game like AC/DC.
Houdini looked to me like a very polished prototype. It's really nice looking. The S hots are too narrow for my skill level. It was a brick-fest for me. 
In a perfect world of restraint and sensibility, I would be looking for these games next year. Even better, HUO or routed versions of those built at the end of the run, a year later! What an awesome time to have pinball as your hobby.
I've owned or own MM and AFM. Great games but obviously not as exciting to me as I've already had that experience.
