Rainer:
S&W semi’s are OK guns but definitely a step below a Sig, Beretta, H&K and such. $400 for the gun and 3 SS hi-cap mags is a reasonable price.
IMHO a 5906 is certainly too heavy for concealed carry wear.
This gun was made in the late 80’s or early 90’s. S&W had terrible quality control problems back then. I remember going through a batch of seized NIB 5906’s a few years ago and finding that many were unserviceable right out of the box. However, since you’ve fired it with no problems, it’s apparently OK.
Until you learn how to do it, you’ll find disassembly is a real pain.
I don’t know about 5906’s, but when the 6906’s were first introduced, there was a recall on the grips. The original grips were brittle and could break if the gun was dropped. This is very bad since the grip holds the mainspring in place, which means dropping the gun could render it unworkable. If you get the pistol, you might want to touch base with S&W re: this recall.
(The original 6906’s also had problems with the hammer dropping into the half cock notch when the trigger was pulled, and with loose sear springs. However, these problems were cleared up very quickly. Not so with the grips.)
I had two different S&W semi’s break drawbars on me back in the early 90’s. During the same time frame, I also had the manual safety on a 6906 automatically engage itself during a formal qualification course. Maybe I’ve just been unlucky, but I’ll never again carry a S&W semi for self-protection.