All of these RO system companies are just resellers. They buy membranes, housings, carbon blocks, and sediment filters and put them together and slap some stickers on them. The fancier ones have their own housings made. Just a few industrial type companies make RO membranes, Dow Filmtec are the best. The only thing worth paying for is a company that tests/guarantees >98% rejection on the membrane. Otherwise they are all the same with a few exceptions. Buy a cheap housing and put good cartridges in them.