I mounted the Trijicon MRO on a Design Machine mount two weeks ago and after a couple of range trips, I couldn't be happier with the combination. It gives a cheek weld very similar to an AR with a lower 1/3 co-witness mount. It's precision is more than adequate, the field of view is great, and with the good cheek weld the low mount allows, it is very fast.
On the down side, it was a very tight fit on the back and that made it a bit difficult to line up the hardware, but it's nothing that a couple of taps with a punch couldn't fix and I don't think it is going anywhere.
Bottom line: I highly recommend both the optic and the mount.