I installed a RO system. I opted for an American made 5-stage system after reading flaming reviews on the Chinese units. This unit oozed quality, top quality fittings, tubes and components, a 5 year warrantee and no Chinglesh instructions. And, only one trip to the hardware store for a "T" not in the kit. The filters, two ten micron carbon block and a 5 micron sediment filter and one more small carbon filter after the tank. They need to be replaced every 6-12 months depending on feed quality. All the filters are about $30, I don't know anbout the membrane.
The output is very nice! I like the taste though it seems a little flat. My ice from the ice maker isn't clear like the manufacturer promised...I knew it wouldn't be, but it is less opaque.
All in all, I would recommend it. No more bottled water!