I would go with a name brand, although looking at the ebay one its not bad. I see that it comes with a handheld tds
meter which is useful. But i cant tell which part is the DI
portion. And honestly reading through it they are using 1micron prefilters. for 129 with free shipping its not to bad of a deal. Idealy though I would suggest something with a vertical 10" DI
and not the inline horizontal types (they dont last very long) bulkreefsupply.com or thefilterguys.biz have very nice affordably priced units and are reputible companies.