I did some more reading and agree that Flo disc is a spoked disc not too dissimilar to a deep dish covered wheel. Having said that, I am not totally convinced the difference in quality or performance is as much as the difference in price. Flo sacrifice 'whoop whoop' in order to reduce price. Similarly weight differences in and of themselves have an immaterial impact on performance for the majority of flat and rolling triathlon courses. Aero trumps weight. Even Flo suggest a covered 90 will have almost the same performance as their disc, but the disc is more convenient if you don't want to deal with a cover. Also interesting is they consider their cheaper aluminium/carbon to be slightly faster on most courses. However if you want the 'woop woop' and all the infinitesimal gains then Caden will be a well priced choice, once its available. I like the 'woop woop' too, sounds and feels great when I pass it.