We had a Norcold 1200 series 4 door . It was great until the control boards started missing steps and finally just ran in one mode only . Tried new boards , which worked for a few years . Then even new boards wouldn't work , so ...
Not being particularly interested in spending 10 times the cost of a residential fridge for a direct replacement , we found a unit that fit and has the same capacity as the OEM .
The only real disadvantage of going residential is it runs on AC only .
But , being better insulated , it holds cold longer and ice cream actually gets hard in any part of the freezer .