I bought a 357 sp101 2.25" just a week ago. It is my second revolver, the first being a SW 686 4" with the objectionable lock. The Smith has a much better trigger in my opinion, but the Ruger is just freaking cool. I love it's feel, the obvious strength, and how simple it is to detail strip (if revolvers get detail stripped).
I chose the sp101 over a J frame because I wanted a durable 357 & CCW capable, but shootable without pain. At 26 oz or so, you know you touched off a magnum but it's manageable and fun, at least for me. I've only run a few hundred rounds of 38 and 357 through it so far, and it is breaking in nicely. However I have polished various internal parts to smooth it up some, and replaced the factory mainspring with a 12# from Wolff. I tried the 8# trigger latch/return spring, but felt it was too light for good reset. This weekend I'll see if the 12# works OK versus the factory 14#.
All in all, I really like the SP101 and see it never leaving me. If you are not afraid to tinker a bit to smooth it up it is great fun.
unclenunzie