Hi Dave.
I have one of these. Its a very good RO and does what RO's are supposed to do very well. I can't comment on the RO-Man systems coz I havent got one or know anyone who has.
It's dead easy to install. Comes fully assembled other than putting one connector ihn for your feed hose.
It's a Pure Freedom unit and like Hugo says Andrew there is very helpfull indeed.
Wish my tap TDS was 75.. lol