Beast performs well longer than any other poly I have tried. I usually cut out polys after 2 hitting sessions, but I can keep Beast for 8 sessions. It still plays well after, but I cut it out, just to play it safe for my arm.
Some posters here have complained that it feels plasticky. Since I use it as a cross with gut mains, I have not had that sensation except on a couple of occasions with the 17 gauge.
I prefer the 16 gauge. it feels more solid and I think I hit heavier shots with it.