I have it and I do like it...it was easy to set up and does a great job. I added the seperate add on DI canister too..I figured why not...you can't have water that is too clean if ya know what I mean.
I have the 50 gpd ro/di and it is awesome. I like the idea that you dont need a back flush kit with it either. And the cartridges are cheap and easy to find.
i just got mine this weekend, got the first 10 gallons out of the way and am starting to mix some new salt water for my first waterchange with it, did you guys notice a change in your tank once you started using r/o water?
