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Technically, they used to say roller reefing and roller furling were two different things but most of us use the words interchangably and mean roller reefing, where you can roll up part of the sail to reef it, instead of furling where the sail is only stowed on the furler.
A used roller-whatever should still work well. I would contact the maker to ask how the design compares to what they offer now, and if there are replaceable parts what they suggest about them. Many use high density plastic ball bearings, eventually those may need replacement.
They are awfully convenient and even better if you can furl with them, how well they compare depends on how well the sails are made. In theory they may work better because the sail is going all the way up to the foil, without the rough air caused by the hanks ahead of it.
But still, a used sail will be a used sail.