I got their 5 stage unit. Here's what I didn't like:
[*]It supposedly came with an adaptor / valve to go between the water supply coming out of the wall and the faucet. Whatever it was that came with it I either buggered up immediately or it was just not threaded properly. I then took several trips back and forth from the hardware store to get the stuff I needed to make it work like I wanted. BRS has the appropriate valve in stock.
[*]All of the tubing is white. (BRS I believe color codes theirs in red, white, blue, and green.) This is just a nuisance when it comes to figuring out what goes where. Although it's pre-assembled. . .
[*]I'm not convinced everything was hooked up right in the box. I do know that it was set up to flow right to left, and I wanted left to right for where I was going to put it. The directions are not that great and obviously translated from another language. I ended up going to the BRS website to figure out how to put everything together the way I wanted it. (This was my first RODI unit.)
[*]Both carbon blocks are the same. BRS has two different micron sizes so you get progressive as opposed to redundant filtration.
[*]I had some leaks at first. To be fair, that might have been the result of my disassembly and reassembly. They were resolved in any case.
[*]The deionization resin in this unit does not appear to be refillable.
[*]Vs. the same type from BRS, the one canister of the three was clear. I think all BRS canisters are clear. (I guess this isn't all that important, but I like the idea.)
Regardless, once properly assembled this unit will provide purer water at a long run lower cost than the Tap Water Filter from Aquarium Pharmacuticals (which is what I think you were using). I have tested the output from mine with a pen type TDS meter and I have 117ppm going in and 0 coming out. It just eneded up be a lot of work to save about $20 in the long run.