RO/DI filters

[yagimax]

Wow , my very first posting.

I'm planning on purchasing an Aquasafe RO/DI 100gpd 6 stage filter system from an Ebay vendor at a price of $130.00.
How do these compare to the Aqua FX or Kent Marine units costing
almost 3 times more ?

thanks..............Gary
(A newbe in Victoria B.C.)