I didn't buy this item from Amazon but I have fished with it.  I first recieved the Hi-Seas Grand Slam brand of fishing lines as part of promotion for buying a fishing reel on another site.  I had little faith in the line since it was a promotion but used it anyway.  I was so impressed I decided to try their black widow brand.  I bought the 12lb test and have caught a few striped bass in the 12-25lb range with ease and no breakage.  I use a improved clinch knot and it very easy to tie, does not slip or break when tightening my knot.  Only problem I had at first was wind knots but that might have been because I put on too much line, I'm not use to the thin diameter when compared to regular mono fishing lines.  Because of the thinner diameter you can have a little more line on the spool than standard mono which is ofcourse thicker, but after cutting off about 10-15 yards wind knots were no longer a problem.  The line casts very well and smooth, even into a strong wind.  As mention above, the line is very strong and I have caught 3 stripers well over the 12lb test rating.  All in all, a great fishing line at a great price.  Its half the price of braided but with almost the same qualities.  In my opinion you can't go wrong with any of the Hi Seas mono fishing line brands.