I ran the MR2 for 2 years. It's a good skimmer there is no question. Right up until you neglect cleaning it. Looking back I'd have to admit mine probably was not running at it's peak probably 50% of the time. I've also run a bunch of Euro skimmers, 6-2, 6-3, ASM G4, and I'm now running a 12-2, a 12-3, and a 12-3+. The Euro reefs are darn good skimmers, as mentioned service can be hit or miss. The ASM I thought was flimsy. I also now have about 6 Deltecs and although I've not run one yet they are by far the best built skimmer I've seen to date.
One thing to consider is energy efficiently. Keep in mind the down drafts and Beckets get very hungry (especially when you get into the large ones)