Played 3 sets over 2 hours with the Polyfibre Gutex this morning. I'll write a full review after my next hit. The string shares many characteristics with Mantis Comfort Synthetic. I don't think it is quite as soft, but it does seem to have a little more spin probably because of the rough texture of the string. Unlike MCS, I did get quite a few balls that trampolined off my racket and took off. It makes the same thud sound when you hit the ball like MCS. The strings move like crazy and are much harder to put back in place due to the texture of the string. Not good for posters with OCD like KCraig.
I ended up cutting this out over 3 sets. Getting back into poly hybrids at the moment.