I have one its very good IMO, i have a 200gpd ro and it now dose about 500lts in 13hrs.
You need to buy a plug in timer from argos as it was advised to me that every few hours you switch it off for 15min to let it cool down as they are not ment non stop(but this is up to you), iv done this and had no problems in the 6 months iv had it.
cheers joe