I finally found a NIB SP101 in .22 with the 4.2" barrel and hi-viz sight! Picked it up for a fairly decent price to boot. Needless to say I'm a happy camper. She was test fired at the end of October last year.
I just got back from the range where I put a mix of CCI MiniMags, Federal Bulk (red box), CCI standard velocity, and CCI Blazer down the pipe, between 200-250 rounds total. All rounds fired without a hitch. After getting it sighted in this thing was a tack driver at 15 yards in single action. IMO it shot the CCI standard velocity shot the best followed by the MiniMags.
The action started VERY tight and heavy but smooth. After this initial break-in session it has lighted up a bit and is fairly pleasant to shoot, although not nearly as nice as my old GP100. I guess that's what happens when a gun is shot for 20+ years though.

I may still look into an getting an trigger job done and adding a Wolff spring kit, but I'm not looking to loose any reliability.
The finish on this revolver is very nice. I've always enjoyed Ruger's stainless finishes. I was surprised to see as many MIM parts on the gun as there are but it doesn't really bother me at all. I am probably going to be purchasing a Hogue grip for it as I can only comfortably get a two finger hold on the grip and would prefer to fit all three.
Of course the obligatory pictures:
Here she is with her older sibling:
And here she is with her older sibling and distant cousin:
All in all I am very pleased with this purchase. I look forward to many years of use and enjoyment with this little 8-shooter. Cheers,
-Joe