I'd give these strings 5 stars, but I've only got 8 hours on them. I had this strung in my Babolat Aerodrive plus at 58lbs, have Babolat RPM Blast in my second Aerodrive plus at 58 lbs. I really like the Spiky Shark over the Blast. I can generate as much spin with the Shark, but without the elbow becoming tender. I can really take heavy cuts and keep the ball inside the baseline. Tension holds well, haven't noticed excessive wear. Price is good.
This 8-sided string has produced improved spin, control and pace on my serve. Have had good success serving at the 4.0-4.5 levels. Also, it has eliminated elbow pain that I've experienced from stiffer spin-oriented strings.