Where I surf, I know a few guys who use the Unifiber masts in the Severne Reflex sails.
They seem to be happy with it.
One of them used to sail slalom competitions.
Of course, if you have the budget and don't want to take any risk, you should go for the recommended Enigma mast. But if you're going for perfection, then I say you should also go for the enigma mast of the same year as the Reflex sail, because masts tend to differ slightly over years ...
IS87 / IS101 / RRD114 / US147