My Dometic died in fall of 2017 and I ended up swapping to a Samsung RF18.
I did have to make some cabinet adjustments but it has been a good move overall. The Dometic was about 6-8 inches shorter and I lost the drawer that was under the Dometic (which I really didn't use anyhow). I also had to move the upper cabinet up about an inch. It was tight due to the plumbing air vent but I made it work. I also bought a little device that keeps the refrigerator and freezer closed.
From an installation standpoint, I was able to get the Dometic out and the Samsung in via my front door. I did have to remove the doors off of both as well as the hinges and feet.
I wouldn't go back - more space, better lighting, better cooling. Its a great upgrade.