Hi Steve.
I can't comment on the RO-MAN one coz I,ve never seen one.
I have the Pure Freedom 300GPD one though and I am very pleased with it. I am decent but not great water pressure and get around 98% TDS reduction and always have plenty of water to spare. I produce into a 1000 litre IBC and draw off 400 to 500 ltrs a day. Waste to pure is around 1 to 1. It was dead easy to set up coz they send them out fully assembled. They are selling some on Ebay at the mo for about £160.00 all in.