I love my 637 with it's 1-7/8" tube. It conceals almost as easily as my LCP but is much easier to shoot and throws 150% more boolit. Now, I wouldn't have it with a longer barrel even though S&W has made runs of them with 2.5 and 3 inch barrels. That would preclude it from pocket carry, if I'm going to carry IWB or on the belt I much prefer a larger six shot revolver or a bottom feeder.