We replaced our original refrigerator on our 1997 Mainship three years ago with a Isotherm unit, and only wish we had done it sooner. Separate compressors for the frig/freezer, and everything stays cold. Milk lasts well passed expiration date, and my ice cream is rock hard.
The compressors are actually DC, so I operate mine from the DC panel. Current draw seems very low, although I have no specifics.