I used to have a renn 36 in roller mill, it did not impress me at all, it designed to bruise maize in canada, and everything on it it u.s imperial size, the quailty of finish it left wasnt good either. One of its biggest problems was dealing with chaff in the hopper, as it blocked the flow of grain to the rollers.
I have now got a superior super 16 , which has 48in rollers and to date have rolled about 1800t with it, and im v impressed. The quality of finish it leaves is very good. It has been designed with the uk in mind, and will leave a good sample. I have used a smaller superior model which was v good also although i only had it for a few hours.