I just had a RIO Switch Chucker 6 wt fly line break on me yesterday while fishing. It came apart about 3 feet from the tip when I was casting it. I just purchased this line on January 20th and it was on it's first fishing outing. Called RIO and was told to send it to warranty service at RIO for evaluation and replacement. Hope not to lose $100 here as have no experience with RIO warranty. Guess I'll see in time. First fly line I have ever had break for any reason, I own 5 other RIO lines and have had no problems yet.
Rio is reputed to be very good with their warranty, so I don't expect you'll have any problems.
I had an Airflo Elite DT WF3F break, but that was user error. I was casting upstream into a pool, which ran over some rocks at its end as it plunged below into the pool I was standing in. I thought I had things all lined out pretty well, stripping line in as the fly, leader and line worked its way back to me. I pushed it on the drift, and waited to long to lift the line up to re-cast, and the front of the fly line just above the welded loop got caught around a rock at the top of the plunge. I yanked on it and moved my rod tip in a circle, hoping to free it. All I ended up doing was cutting the line on a very sharp edge of the rock. I tied on a butt section with a perfection loop at the end, and resumed fishing. My situation sounds different from yours, where your line just came apart, I sliced mine stupidly on a sharp rock.
