did you buy your system from the company in your link, Aqua-Safe?
Yes I did and I couldn't be happier with it. The link I posted is a six stage while mine is a five stage. However, I paid the same for mine as the better unit above costs.
I would point out that if I were going to buy another RO
unit, I would buy at least a 100 GPD model, but no less than 75 GPD. I know you said you really didn't need one above 35 GPD, but when you think about it, it will take you over 4 hours to fill up a 5 gallon bucket using a unit that produces only 35 GPD. On the other hand, if you get a 75 GPD model, you could fill that same 5 gallon bucket up in about 1 hour and 20 minutes.
I have a 75 GPD and keep all my water stored in a Rubbermaid Brute 44 gallon trashcan. I am constantly topping of that trashcan to make up for evaporation out of the can (which is minimal but still happens), water changes to the tank, and top off water to the tank (my tank evaporates 2 gallons a day).
Without my 75 GPD unit, I would always be worried I could run out of water if something major happend to my tank to force a large water change.