There are really two separate issues here. The first one is whether or not replacing the cooling unit is the best choice and the second is the issue of who to get the cooling unit from.
The way that I looked at this when our 11 year old Norcold failed was this. The RV refrigerators were in the midst of a major recall for issues of fires caused by leaks so a re-manufactured unit might still have that same problem. In addition, even if that cooling unit should be perfect, or perhaps even better than the one we had originally, the refrigerator would still be operating with a series of circuit boards and electrical components that are now 11 years old and which will have no guarantee! The question becomes, will the replacement of that cooling unit be a long term fix, or will some other component fail soon after? Although I consider myself to be somewhat more skilled in trouble shooting than the typical RV owner, the refrigerators are one of the more difficult appliances to deal with and most of the service information is of mediocre quality and helpfulness. If I replace the entire refrigerator, I then start with a new one that has a new warranty, while only the cooling unit would be covered with it's replacement.
Even if the cooling unit is covered by warranty, who gets the fun of removing the warranted unit, packing it up and shipping it, then installing another when the replacement comes? Since we had no other place to live but our RV at that time, we just did not want to deal with the extra time and the work involved in doing this repair myself, so I chose to go with a new refrigerator. Had we been in the situation that we are today with a home-base and a refrigerator to use while this one is out of service, then I might have replaced the unit, but that would still have left us dependent upon the 11 year old controls. To us, it was a case of balancing the saving of some money against the advantages of the new refrigerator.
One other thing to consider is that RV refrigerators have improved some in the past 10 years. We found that our replacement refrigerator which fits the original opening in the RV has nearly 1 cubic foot more interior space, due to design changes. Replacing the refrigerator is not a case of having the exact same thing that you had when you bought the RV.
Here is a little data about these cooling units. They are built by an Amish Refrigeration Manufacturer that mainly builds complete Home Refrigerators & Home Freezer Units. Most of the companies that re-manufacture cooling units that you have read about or find on the Internet, only re-work the old cores of defective units. That's the norm. The one thing that sets this manufacturer apart from all others is they do both new and re-manufactured units without doing the normal types of repairs, such as using the standard cooling charge of ammonia and the hydrogen pressure charge.
I still question this statement. If he is implying that the units are made by Amana, that don't hold water as they are no longer owned by a religious colony. It is very popular to make such claims and a great example is the gas heater that has been widely advertised on TV as Amish made, but is not true
. It is very easy to make such claims, but he sure don't support that claim.