I'm using the natural color Power Fiber II. As for mixing multis in hybrids, I've only done that with RIP Control and MCS and one time (by accident) with Prince Recoil. My "gut" feeling is that Gamma Pro is not going to meet my durability needs but I could be wrong.
As for durability, I updated the review since it was unclear that I had broken the strings. Read the durability section over again and you'll see I got pretty good mileage out of it. It looks wirey but it just has one strand like Klip Venom and Discho Acura running along the length of the string. It was easy to string and actually pretty soft.