John:
Crystal Cold has a less-than-stellar reputation, I understand, due to the very factors you mention. I'm sure that basing it on an electric fridge doesn't help.
My understanding about current gas fridges is that they work best in the smaller sizes, and are still marginal performers. I remember a Servel we had when I was very small. It wasn't that I was a budding appliance-head, it was that my mother absolutely hated the thing and said so, long, loud and often. That impressed itself on my memory. In later years I asked her about it, and she said, "It wouldn't keep stuff really cold, and forget about making ice."
P.S.: I'm wondering if you have some cosmetic parts for a GE J 757 range I recently acquired? My biggest need is for control panel glass.