I've tried Polymaster II for a few hours today. I usually play in the 60's but the cold weather has made things very stiff feeling and the Polymaster packaging recommends max tension of 55lbs so I went with that.
It's a quality string with good spin, control and normal power for a poly. Feel wasn't lively but the cold temp may have something to do with that. Still, it was comfortable and I'll be giving it much more court time, and hopefully indoor too.