whats your opinion on this filter

way, way, way, way, way too expensive. Just go with a sump and buy a skimmer, and youd still probably come in cheaper then that.

W/D filters are kind of an old way to do SW tanks.
 
you didn't say if this was for a FO tank or Reef. If it is for a FO tank then it's just fine. Bit pricey but if you like the "no work, no mess" all-in-one then it's a good way to go.
 
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