An old fridge can be a good option if you find the right one for the right price and can test it before you buy. There is always the chance it will die a timley death, which can be anytime, it is old after all.
I lucked out getting all the mechanicals from a truck camper for $50.00
SOmeone who had big plans to build a small trailer, but then never went through with it and got tired of looking at the stuff
The one you linked to is a great buy, that fridge would be almost $900 up here in the land of polar bears and igloos.
Still by all means expensive, but the convenience of have refridgeration while drycamping is worth it in my opinion
The fact that it is non-electronic is the biggest plus, if I hadn't of lucked out, and purchased new, the N260 would have been the one I would have chose, Its small, but they don't waste space putting in a useless tiny freezer.
And with that fridge, I would have let my wife bring along 6 cans of soup so as to not take up valuble beer space with pointless food

And remember, canned beer takes less space then bottles
The new ones, as far as not having as thick of tubing as the old ones work just fine,
pay attention to proper installation ie: venting and clearances
and proper operating ie: leveling during operation
Should provide many years of service, will the new ones last 40 years, doubt it but possible, but I don't think 10 - 15 years is unreasonable
One way that may extend the life of a fridge would be to pull it every couple years and put a fresh coat of heat paint on the tubing to slow or prevent them from rusting, just don't scrape rust off for risk of damaging the cooling unit, just paint over, thin coat though to not hinder its efficiency