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I've bought several used canisters and find there are a few points to look at before buying. One is to hear it run. When n impeller or shaft is worn, it can make noise and those items are pretty expensive, so people do try to pass their problem on to you. Hear it run without almost totally silent so that you have to feel the vibration on the can. For the smaller size Eheim, I feel those prices are a bit high for my area but that varies in places.
 

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I don't have the Sun Sun on hand to compare but find there are some general things that Eheim may do better. That might give you some specifics to look at on both.
What type and quality of media is included with both. Some of the cheaper do not provide media and it can be a hassle to DIY or expense to buy good media. I find the Eheim impeller shaft is ceramic which is a much better thing as it is much tougher. No rusting or bending as well as less prone to scoring if sand gets next to the shaft.
 
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