Did yours have any symptoms/breakdown before going completely kaput?
Know exactly what died out?
Know the SunSun model?
As a precaution, I got the 304B over the newer 404B just because I knew the older model, being out longer, had reports of lasting over 4 years. But I haven't heard of any premature deaths of the 404B models, and as far as I know, they motor and impeller are still the same as the 304B, just some added features to the head unit and a grey paintjob.
I've had my SunSun 304B's for over 2 years now. I was late to the whole canister filter party though, but I have heard others that still have their SunSun's working 5+ years and still going.
Not denying your experience, it is very valuable to hear reports, good and bad, just curious is all.
Also when I was researching Eheim canisters, I was finding quite a lot of failure reports on the ECCO canisters. No doubt Eheim canister filters are top notch, but it appears not all of their models do well. Research is always advised before purchasing (I am sure you know, just a reminder to everyone else who may read this).