I bought one several weeks ago and haven't stopped smiling. I had a 342 Ti that was a joy to carry, but wouldn't allow me to use 158 gr. +P LHP's. Every jacketed hollow-point I tried in the 125 gr. weight shot waaay off from the sights. I never felt confident in my ability to deliver a precision shot if necessary, even as close as 7 yds where the groups were often 4" from point of aim. I felt like I was carrying a dart gun.
My troubles ended when I picked up a like new 638 for $275 at auction. At the range, the first 5 rounds of Remington 158 gr. LHP's clustered into a one-inch target paster at 30', right at the point of aim. My factory duplication reloads using a Speer 158 gr. swaged HP crowd into the same hole made by the factory fodder. The single action is very good, allowing 2" groups at 50' if I do my part, and at least one or two of the five shots will take out the 1" orange target paster at that range. . Although it's not likely that defensive shots would take place at 50', it is great practice for trigger control and demonstrates that the gun is up to the application if I am. It's a great confidence builder as well. Double action is also very nice. While not as featherly light as its titanium predecessor, the Airweight Bodyguard and an Uncle Mike's #3 holster fit easily in my jeans front pocket. The satin finish is perfect, sights are adequate for their purpose. Recoil with the 158 gr. +P's is noticeable, but easily managed with practice. I replaced the Uncle Mike boot grips with Hogue Bantams that I prefer.
I am sooo much happier carrying this revolver. I haven't had a chance to shoot it at long range, but I honestly feel that, if I can see it, I can hit it with a fair sized chunk of lead. This is the first fixed sight BUG that afforded me that confidence.
I think you'll like it.