I put them on for the first time this morning and fell in love with them straight away! I've worn Billfish for years and have seen them at Cabela's - of course they didn't fit me in the size and color I wanted. I also wear 11 1/2 M and they are great, love the varying arch support. I don't fish in boat shoes as I'm barefoot or in flip flops so I can't comment on that. They're lighter than Billfish and I think I'll use them as long as Sperry makes them! If you like Topsiders, you'll love this!