I (well, my 5 year old) has the Marvel. It isn't bad for what it is. I got it for free for doing a driver board repair on a STTNG, do I can't complain.
I've had to repair it quite a few times. The ball shooter is made of 100% plastic, and the piece that holds the spring that actuated the ball release broke off. Had to drill a hole to accommodate the spring. Had to fix this a few times. The display was going in and out due to a bad ribbon cable, so I cable tied the cable together where it fastens to the board. The ac plug broke in the back of the game, so I put a new adapter input on the back. Lastly, it has survived enough plays that the flippers got too weak to make the ramp shots, do I had to shim up the front.
Don't spend more than $100, otherwise you'll feel pissed when you throw it away. It is a consumer good, not built to take a beating like a commercial pin.
Read some online reviews. Lots of pissed off people that paid $400 new for them.
Mike