I made a post on a Spey fishing forum responding to a question about Scientific Anglers Fly Lines. I stated that I like all my lines and had only ever had one problem. I had a welded loop break this past spring on one of my sink tips. I mentioned this very matter of fact and not as a warning or a complaint.
I was surprised when I got a PM from a SA rep who read my post and he took my mailing address and three days ago a UPS truck pulled in the drive and the driver handed me an envelope. Inside the package were two new tips, a 120 grain type 4 and a 160 grain #4. It seems the company nor the rep could guess which I had broke so they sent both.
So if you were ever wondering what will happen if you have a problem with a SA line, there you have it! I think I own between 12 & 14 SA lines.