I have nothing against used, as long as it is in good condition, but I bought new when I couldn't seem to find a good used one.
Before you get an RO, they seem to sound difficult, but once you use it for a few boils you will learn quickly what to do and when to do it. Then you will never again ever want to boil without an R.O.
After you have used the R.O. for 2 weeks it will all be second nature.
When I got mine, I went from 650 taps and had to sell sap the year before because we were boiling 21 hrs a day and couldn't catch up, then with the RO, I doubled my taps and still processed sap for others on shares. All that and burned less wood.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.