Oh OK, I thought that stuff WAS Amsteel.
I bought some Amsteel from Anapolis Performance Sailing, but I thought it was rather slippery - Garda Hitch won't hold on it, although the bowline holds fine. The Garda works fine on the Spyderline, so I still like it the best I guess, but I like the higher strength to weight of Amsteel so my ears perk up when I hear braided spectra with no sheath that isn't slick!