I've had two Ruger SP101's and I just didn't like them. My primary complaints are the crane is too short for fast reloads, it's too heavy, and capacity is only five.
I do like the simple design and the ability to take the gun apart in two minutes. $25 in parts (shims from triggershims.com and Wolf springs) makes for simple trigger work. Meprolight makes a Tritium front sight and can be installed.
Too bad it's not a six shot gun with a slightly longer crane and a 3" barrel
That would make a nice belt gun.