S&W's warranty certainly does have limitations, as noted above.
I bought a 6" 25-5 in nickel a while back. It had a very bad case of push off, I'm sure the previous owner went nuts with a stone and destroyed the hammer. I tried replacement but could not get the gun to function properly, I guess it just needed hand fitting. For $100, S&W replaced the hammer and made it all work again. I paid $550 for the gun so another $100 to make it functional was worthwhile, but that wasn't warranty work. Now I can't really expect them give me free service for a user's intentional damage but since I limit myself to mostly used guns, nobody's warranty make much difference to me. Instead, I just try to buy high quality so it doesn't ever have to go back to the factory (ie: Taurus, Charter Arms, etc.)