I've got an MR920 Combat w/ optic cut, bought it used. It wasn't until I played around with the back straps that I realized how well it could shoot. It feels like what a Glock should have from the very beginning and for a carry gun - the trigger is fine. Mine's around 5lbs and breaks nicely. The optic mounting system is nice on the Shadows, I've got a Holosun on mine with no plate and it's holding on well.
Had some reliability problems with mine, probably why it was traded in. Found it to be the Magpul mags, I shoved a Glock OEM mag in and had no more problems.
Likes: Optic mount, clever back straps, beavertail, and the sights.
Dislikes: Price, trigger pull. I still greatly prefer my PDP Compact, it just has a much nicer trigger and shoots just as well - for $200 less.
If you like your DR920, you'll like the MR as well - just be cautious of the mags they come with.