I starded using this last year and got "hooked" on it. Works great and knots are easy to tie and they stay tied. It is a braid type of line. I have used spider wire and fireline previously and IMOP, this excedes both those. The 30 Lb. test would be equivalent to the diameter of 8 Lb. test in mono. 40 Lb. = 10 Lb. Mono. 50 Lb. = 12 Lb. Mono. So, same diameter but much stronger. I just got a new mitchell spinning reel and another 150 Ft. of the power pro to put on. This setup will be going on my Whoopin Stick. It should be a walleye catching son of a gun. Anyone fish for walleye?