Eheims used to be the most expensive canister filters made. And people always said they were worth it, because they'll last forever. I remember always wishing I could afford one when I was a teenager back in the late 80s, and having to "settle" for a used Fluval someone gave me. I think older Eheims, back in the 80s and early 90s were probably over-engineered. At some point engineers were probably brought in the try and lower costs by trying to change the exact type of plastic used, change it's thickness, etc.
The 2217 on Amazon is a LOT cheaper than other canister filters at the same flow rate. You can't race to the bottom of the price chain without cutting corners somewhere.
There's a reason why Dynaflo 150 power filters still work like champs 35-40 years later, while other filters end up in the scrap pile.