I'll probably convert a .40 S&W Hi Power to a 357 Sig later in the year, along with some customization.
The round is fast becoming my favorite. While I don't own a 357 Sig yet, I do shoot one when I train with a friend of mine. It's his preferred caliber and I get to shoot one of many 357 Sigs almost every outing. I'm really liking the recoil impulse as it tends to not "flip" as much as the .40 S&W, but have more of a straight back "push".
Another thing I'm liking is the ballistics, at least on paper. Since I load +P+ in my 9mm I see the 357 Sig as a natural progression for me.
Biker