J-frames are excellent "all the time" guns. I carried a Bodyguard 649 (shrouded hammer) for nine months every day, either as my primary or backup. You can drop one in a pocket with a pocket holster and nobody has a clue. Mine was all steel... two Bianchi Speed Strips for reloads in the other pocket.
The Airweight models are the best compromise for carrying, yet being easy to shoot. Many people can't shoot the scandium/titaniums well, they're superlight but hard to shoot with hotter loads.
A 642 Centennial (completely enclosed hammer) to defeat lint and gunk from pockets (a problem I had with the 649), with a good pocket holster, and the new Speer Gold Dot .38 +P load specifically designed for these guns (short barrel low velocity fast expansion), would be ideal.
J-frames do take quite a bit of shooting to get good with especially if you don't shoot revolvers much. I'd say 400 rounds to get proficient, at close to medium ranges shot double action only. It took me about 150 to get good with mine but I've shot revolvers for years.
They don't have much in the way of sights, but they're enough for the range you use one at. Some people have the rear sight notch opened up a bit for speed and better sighting.
Edit: If you polled every armed cop or concealed carrier in the country, about 50-60% would probably be carrying a J-frame as a backup gun for cops, or have one in their pocket for CCW among the others, or had previously had one. At the first annual meeting of the International Defensive Pistol Association board (shooting game more combat oriented than most) every single member of the board was armed with a Chief's Special.