Along Gb's lines..no pun intended. I had my 30 pound PP snap twice on me this summer casting #5 Mepps on the back lakes. Wind knot on spool, snap, bucktail sails off into the distance.
I too put Spiderwire Stealth on my trolling reel a couple weeks ago... after seeing it in action for 4 days with Thorpe. I had an old roll of 65lb PPro here and I used it as backing for the new 65lb Spiderwire Stealth. As I'm tying the uni to unit knot to join them I found the powerpro was stiff...the wrap thru would unwind if you let go of it etc...where as the Stealth is extremely limp..you can let go of it and it doesn't spring back. I've also noticed it isn't fraying, or losing colour anywhere near as quickly as the powerpro does, and as you know that line has been getting a bi-weekly work out lately in Zebra infested water.
Consider Marc uses his stuff daily...10 hours daily, 200 days a year. He reties when he thinks of it..once a week or every two whether it needs it or not.