I am on my 2nd year with Airflo lines. I really like them. I was a big Orvis Generation fly line guy as well as Sci Angler but the owner of a shop I go to told me about them and said I should give it a try. The line really shoots and it is very fun to roll cast with. I want to get a double taper and try it just to see the difference from the weight forward. Like you said Sci Angler has some competition. The only bad thing in my opinion about the line is it loses its slickness faster than Sci Angler. I catch cleaning my Airflo a lot more than Sci Angler. Overall though in my opinion it is a great line and well worth the money. I haven't experimented with rio fly line at all though.