The Model 13 S&W is a good solid revolver. It's basically a Model 19 designed for law enforement without the adjustable target sights but with a bull barrel and is best suited for 38 special as the main cartridge but able to fire 357 if the need was there. They're a good carry revolver as well with not much to snag your clothing.
I've had a Model 13-1 for some time now as well as a Model 19-3 I bought new in 1975. The 13-1 came with magna grips but I put on a set of wooden target grips that match the 19-3. I've had no issues with either one and both have been fired plenty. But mainly with 38 spec.
If you're going to be disassembling the gun heed the previous advice that's been given. If you're mechanically enclined and have worked on guns before, well, you should be okay. One very important advice is when removing the sideplate, don't be prying up on it with a screwdriver. That's not the way to remove it. After the grips and screws are carefully removed; take the screwdriver handle and give the grip frame a couple of solid raps. The sideplate will just pop off. If you do what many have done and that's pry up on the bottom of the sideplate on the grip frame, you'll put a tell tale burr on the top right hand corner of the sideplate to remind you every time you look at it you did it wrong. They're fairly straight forward to work on if you're carefull. The front sideplate screw is what holds the cylinder yoke in. To pull the cylinder off for cleaning, remove that front screw, swing out the cylinder and slide it and the yoke forward. Sideplate and cylinder is probably all you should need to remove if you want to give it a cleaning. If you're not sure of yourself, you may be best to leave the rest as it is. You can flush it out without removing anything else. Oh, when you reassemble the sideplate don't horse it on , but take time to figure out how the hammer block fits in there. Pull it straight up between the hammer and frame and when you install the sideplate make sure the hammer block slides into the groove.
Regards:
Rod