Tutt,
The one I fired was a blast ... literally. I fired both 454s and 460s from it and found the felt recoil was worse with the 454s, but the blast and flash worse with the 460s.
I think the 454s were like 260gr bullets while the 460s were the 200gr Hornady's with the little pointy red tip.
I fired this in an indoor range while my wife filmed it with her Canon digital camera. The pics I have are captures from the video and are using ambient light and muzzle flashes only.

Yeah, my hands are in that fire ball somewhere.

L to R: .45 Colt, 454 Casuall, 460 S&W Mag.
The over pressures were so bad they jammed my glasses back on my face and pushed my earmuffs back a bit. All this time it was also blowing cartridge boxes off the platform in front of me.
The gun belonged to a guy who had just moved to IL and had not even fired it yet. He and his son had tried .45 Colts, then a couple 454s. After the 454s they were afraid to shoot the 460s. I'm not, I'll shoot anything at least once.
I found the recoil to be surprisingly reasonable for what I was shooting. I suspect it was because of the venting or porting S&W had on the muzzle of that 4" barrel.
I said it in the original post I did on this gun over at Handloads.com, that thing was a hoot to shoot.

If someone gave me one I'd sure not turn it down, but I ain't gonna pony up the bucks and buy one for myself.
Joe