My friend uses it. I haven't tried it yet, I always buy line in bulk, so once it's used up, I am going to try it. He said it double flairs real nice. If you don't have a good flair tool, I found one that is similar to a pair of vice grips and has the various sizes built in. It's the easiest one I've ever used, one piece, you can use it on the car, even in tight spaces. I got it from JC Whitney, not a name brand and have seen similar ones on Amazon. I will see if I can find a link or snap a pic of mine. It was cheap, and works great!