I'm an off-ding putter and the Rossa serves me well. Alas, I'd rather propose to go for ding putting + moving the marker. The reason is that off-ding will come to it's limits too early, sometimes on very fast greens but certainly on tourney+championship greens. You can't compensate severe slopes due to the limiting lines, and the variation in putting speed becomes an issue there. Then it's inevitable to move the marker and, having some practice already would be helpful.