I've held one, shot a few rounds, but no real serious work with them.
I find them kinda neat - 30 rounds at a time is really cool.
personal observations: no science here
small gun. very slim. good balance. could use a bit more bulk for my hands
like the FO sights. lines up well in my grip.
decent accuracy. However, certainly not a bullseye gun (at least not in my hands)
22mag certainly knocks a bowling pin and softballs around
recoil easily handled. kicks less than I thought it would for the weight of the gun. I would have to say good ergonomics are the root of that.
lots o flash from that short muzzle. not as noisy as my 357, but about as bright.
fired 20 rounds. no jams with maxi mags.
overall impression - wanted one terribly till I shot one. still want one, but not nearly as much. I'll wait for a great deal. It'll be a range toy, not a serious work gun. Still contemplating a for PD use. certainly an easily concealable one, and 30 22mags on tap might do some real damage.