I thought that a comparison picture might be of interest to those people that have never seen a 9mm revolver. Clockwise there is a P&R Medusa, a S&W 547 (both do not require moon clips), a Ruger SP101, S&W 940 and a Ruger Service Six.
My experience with these guns has been totally positive. They are dependable, powerful and 9mm ammo has been easier to find than .38 special in my local gun shops.
I have found that 9mm revolver accuracy is much more ammo dependent (both bullet weight and ammo brand) than most semi-autos I have used.