I have used P-Line for some time now; 6lb, 8lb and 10lb. Seems that it doesn't fair well with spinning reels, especially when drop shotting. Lots of memory and coils like a beotch. Does fine on baitcasters though. Can be stiff but I think a lot of my interpretation of stiffness is because the P-Line has like no stretch at all. The 8lb is very strong. If you get snagged it can be tough to break your line off.
BMC