Does anybody have any experience with these?

I was driving through Grand Junction, CO today and used the occasion to visit my first ever Cabela's store. I spotted this product while browsing their fly shop and bought a set. All of my lines are set up with amnesia loops. The concept of a loop that would keep the line tip floating interested me.

Are they good enough to warrant cutting off my amnesia loops and replacing them with this floatinig loop? How do you heat the shrink wrap that fastens the Cortland loop to the line?

Thanks!

Brad