One of my good IDPA friends is a devotee of the 357 SIG. He has several pistols set up for this caliber (1911-style and Glock, for the most part, although I think he has a SIG too) and now competes with them exclusively. He reloads his ammo and tells me he has no more problems with this caliber than any other.
I had a 357 SIG barrel & magazines for my Glock 23 a few years back, but eventually sold the 357 SIG stuff as I didn't use it much at all. I found little discernible difference in shooting the 357 SIG vs the 40 S&W. Recoil impulse is about the same, POA/POI wasn't much different, accuracy was good with both. But ammo is pricier for the 357, so I just stuck with the 40 (at the time I was mostly shooting duty/issued ammo in 40).
