First round stings, second round hurts, third round really hurts
The title of my reply is what Massad Ayoub said about these pistols many years ago when they came out.
I own a stainless steel 640-1 in 357 magnum. Using full power shells, this gun will leave you blind and deaf after the first shot. If you miss an intruder, it will probably give him a heart attack. Even with 38+P or 38s, the gun is a handful.
Like every snubbie, you are trading power, accuracy, capacity and control for compactness, light weight with utter reliability. It's up to you to decide which factors tilt the balance.
Like most snubs, the sights suck unless it has or you install the XS front sight. If you have the gun, this sight is essential in my opinion.
I did my own trigger job and it is smooth as silk, using an India stone, Wolff springs, and an extended firing pin to alleviate worries about a light primer strike.
The airweights are insanely light. Great for carry, not so great for felt recoil. If it comes with the small grips, it is compact but you have the metal backstrap against your palm. If you get the longer grips you gain a pinkie rest and a padded backstrap but lose some concealability.
The hammerlesss models are an awesome idea and I've never had a problem with it. You lose single action but gain snag free use which is great for an ankle holster or pocket. The ones with the shrouded hammer are a compromise on these competing features.
In summary these are very good guns for the purpose of reliable concealed carry. Note well that there are numerous autos with greater capacity and small size but none with 357 magnum power. These pistols are a fistful of dynamite that you will begin to appreciate on the first shot when your hand stings. Just remember that the poor sucker at the other end will be hurting worse, if you hit him. By the fifth round you'll probably be reluctant to pull the trigger. I usually load mine with 38s, or 38+p tops. Like all revolvers, it takes practice to aim and shoot well especially with a factory weight trigger.
If you are not permitted to carry concealed, consider a 686 plus or one of the new 8 round revolvers. I kept my TRR8 in my night stand and a 686 plus locked in my car for years until recently replacing them with autos. If money is a factor, consider buying a used one or a new Ruger GP 100 or SP 101. If you buy a used gun, it is imperative you do a good inspection for end shake, timing, hammer push off, and other wear and tear problems, especially the hand. There are good YouTube videos for revolver inspections and repairs. The good news is that you can buy parts on Brownells easily and put them in yourself. Remember though that revolvers are in a very delicate balance. Minor changes can upset that balance and they will fail in a huge way. Malfunctions rarely happen but when they do they are catastrophic. So consider a good gunsmith instead. I should also mention that S&W had or has a J frame kit gun that you build yourself. The best way to figure out a revolver is to take the darned thing apart and put them back together. Just be prepared to take a tray of parts to a gunsmith if you can't figure it out.
