Walleye's no, pike yes. Walleye's teeth are spread out and the leader goes between their teeth. I always check my snells after each fish - takes 2 seconds. For some reason I for the life of me I can't get a good knot when I go heavier than 15-17 lb mono or floro, so that's why I stop at that line size. I've also used 12 lb test with good results also. I hate pike and if I get into shark infested waters, I move spots altogether or move deeper. If you tie your own harness, you'll be more apt to change them out more often, vs paying 4-5.00 and using it till it falls apart.