I don't remember the name of my unit, but we got a pro to install it, because, well, we were lazy. We have a tank underneath the sink that holds about 2-3g of water ready to go, so you get water faster, and a separate tap just for the RO water.
I remember it not being too badly priced even for the install, but it is cheaper to buy/install a unit yourself. If you are concerned about plumbing installs, the portable units work just as well. :-D
Back on the forum after two moves across two years! Slowly getting back into the hobby!