My boat came with a Harken Mk III which I liked very much with my original 100% jib.
Now I have a new 135 roller-reefing genoa, with luff foams. I am finding it difficult to start the first couple rolls, as the luff foams act as giant speed bumps. I have to pull VERY hard to start furling, and now I need somebody else handling the jib sheet, whereas I could do both before. Once the foams are furled, the rest comes easily.
The sail guy told me this would be an issue when the sail is new, but it should work itself out after it's been sailed and furled a few times. I've only used it twice so far, and I hope his predictions come true. If they don't, however, I'll probably search for something with a larger drum.