I just got my Alien today from CT and so far so good. The head was fairly simple to install, but it didn't boot up the first power on. The screen froze on text saying is was booting the kernal or something like that. I turned it on and off and then it booted up fine. It's needed a few adjustments. The air lock scoop was taking several tries to kick the ball out. A quick adjustment to metal flap fixed that. Also adjusted the slingshot switch, some stand ups, and a switch in the xenomorph head that checks the extents of the tongue. The right 180 ramp sits below the playfield level significantly. A weak shot that doesn't make it can get stuck up against the edge of the playfield. It took tilting out to get the ball loose. I'll have to investigate that to see what can be done. All the lighting appears to be working correctly.
Overall I'm pretty happy with it and my only real concern is future issues and support.