Quoted from misfitdart:
If mmr was put on route and had the same kind of abuse that the original had faced 20+ years ago would it hold up as well?
The thing that everyone forgets or few people know is that machines when you put them on route 20 years ago were prone to immediate breakage, and believe it or not, Stern's quality control is LIGHT YEARS above what Williams was back then.
The reason so many people think that Williams games work so well is that they had a ton of repairs performed on them in the field... until the problems were erased.
I would expect that MMR comes out of the box in a better condition to be routed than MM did 20 years ago. How MMR would hold up in route in 5 years is open to debate. I'm not personally sold on the huge under playfield board, but I also don't see any logical reason that it wouldn't work. Time will tell.