Sigh ...
The only remaining Ruger medium framed DA revolver I have is a stainless Service Six Heavy Barrel 4". Outstanding revolver. After a lot of Magnum rounds had been fired through it, one day I decided to send it off to MagNaPort and have it ported, crowned, & duty tuned (with charge holes numbered), although I kept a factory full power hammer spring. Then I modified the grip frame to a round butt. I'll never part with it, although I seldom use it or carry it anymore. A Quad-Ported SP-101 2.25" DAO gets the duty for .357 Magnum off-duty usage nowadays ...
Anyhow, I've also owned a fair number of Ruger Security/Service/Speed Sixes, in barrel lengths ranging from 2 3/4" - 6". Only one of them had some timing/end shake issues develop.
I'd probably pick up a nice used one if I ever came across one at the right price, or, I may simply pick up a GP-100 3" if I find one at a good price, either with the full shroud or half shroud ...
Sturdy, decent, affordable and reliable revolvers. The triggers aren't S&W or Colt quality, granted, but they fill a market niche.
I also wouldn't bother having an adjustable sight added to a fixed sight Ruger S/S, either ... but that's just me.