I play both an original MM (at Kelly's on Laskin rd.) and my MMr at least 4 to 5 days a week. We go to Kelly's for lunch every day and always play 3 to 4 games, and play mine in the evenings. After playing both regularly for several months, here is my honest review:
MMr is faster than the original. Difference may just be that I keep mine waxed and clean, as opposed to the original that is in good condition, but it's in a bar on route and doesn't get the same maintenance.
MMr shaker is a nice addition, but I guess you can add a shaker to MM.
The sound on my MMr is clearly superior to the original, but I have had a psw10 sub on it from day one. Not sure if there is much difference without one.
Overall play is very much the same. Ramp and Castle shots react the same. The flipper and slings on the MMr are a little more responsive the the original, again probably because of the maintenance.
Build quality of the MMr seems to be comparable to the original.
Overall, although I prefer the original, just because it is, getting a nib for 8k as opposed to paying at least twice that to get a comparable condition restored original, the MMr is a no-brainier. It plays and looks terrific, and regardless of the opposing opinions expressed on here by some ( who's motivation may not lead to an objective opinion ) , I have had a pretty extensive amount of time on both, and the MMr is an excellent "copy" of the original. If I had it to do over, I would still buy the MMr. Anyone that claims any huge difference in quality or play is just wrong and expressing an uninformed opinion that clearly wasn't formed with an objective review of both.