I carried a 5906 as my uniformed duty weapon for roughly half of my career. I liked it. The cartridge was adequate. It was heavy enough to soak up recoil forces making the 9mm an easy cartridge to manage. It had enough capacity, 15 rounds, for just in case (anyway it was more than 6). And, reloads were way faster than with my revolver. BTW, I also carried two additional mags on my duty belt. So, a total of 46 rounds available vs. 18 total rounds with my revolver. Then, since it was SS....well, the finish lasted longer than the traditional blue finish of my previous revolver. But, don't go swimming with it. Hey, it was Hawaii after all. LOL.
I bought this one after I retired.
My actual duty weapon had a bobbed hammer and night sights. We carried with one up the spout and 15 rounds in the mag. Safety was always "off" while on patrol. It was an easy transition for me to get the DA/SA trigger transition, having come from S&W revolvers.
BTW, since we updated from revolvers. I also felt a need to update my off duty weapon. The S&W 3913 was my choice. Same operation, only in a smaller package size.
My actual off duty weapon.
It wasn't as compact as my S&W M60. But, it lay flatter....good for a strong side belt carry, under a shirt or jacket. That being said, today IMHO, it's probably a better range pistol than an EDC/CCW.
Not to mention, that the plastic generation of guns has taken over.
I don't believe that my department has them anymore (for uniform issue) and I have no idea what they are using now.
Aloha, Mark