Shot one a week ago - - -
Guy at local IDPA match was using a 4" 610, shooting .40 S&W in it. Looked interesting and he offered it to me to try. I was using a .40 BHP and shot his 610 with some of my factory 180 JHP ammo. It was not quite like a .22 LR, but it was much like a K-frame with std vel .38 Spl loads--Very manageable and pretty accurate.
I think that, with full power 10 mm loads, it would make a good sidearm out in the rough country for those a little shy about recoil and blast of a .44 Mag.
The 10 mm auto used to be touted as "a semi-automatic .41 magnum." I think the 610 is a revolver version of the automatic version of the .41 mag revolver. Gets a little circular, doesn't it? But one DOES have the option of using the .40 S&W for reduced loads.
Anyway, I'm not going to rush out and get one for myself, but it was fun shooting that one. And the owner did pretty welol int he match, too.
Best,
Johnny