You folks who disagreed with my assessment of the OEM's ability to 'absorb' recoil, while remaining 'smaller', should really compare the two grips. The OEMs permit a higher grasp - a fact of life forced by the shorter grip. This gives the line of action less moment arm distance to your grip, placing more recoil 'down your wrist' rather than about it, which the Hogues do. The Hogues give a better and more comfortable grip, but they do extend more at an angle away and down from the frame. In fact, if you sketch their respective outlines on top of each other on a sheet of paper, you'll see that the OEM grip ends about a third of the way up the second finger groove - and is no wider or thicker than the Hogue at that point. The trigger 'length of pull', the distance from the trigger mid sweep to the grip back centerline - measured parallel to the barrel - is slightly longer (1/16-1/8") for the Hogue.
All that may well be so, but when your middle finger swells twice its size after 10 rounds from the trigger guard, it don't really matter. I can shoot any load with the Hogues, stock grips, forget the heavy stuff. And, why would I carry the gun with .38s in it when I have a far better choice in the Taurus M85UL, 17 ounces, fits in a pocket without notice or an ankle holster, accurate?
I'm selling the Ruger back to my son-in-law because he wants it and I told him I would when he got back from Iraq. I really don't carry it much, have a 3" Taurus M66 medium frame gun which is easier to shoot, a little more accurate, and almost as easy to carry. I have a Hogue on it, too, but it didn't hurt my middle finger with the wood grips on it. Just that I really like Hogue grips.
The SP101 is a powerful, strong little gun and I may get another someday. When I do, it will have the 3" barrel on it. It's definitely NOT a pocket gun and the shorter sight radius of the 2.25" barrel just makes no sense to me. Hold it up side by side with a 2.5" M19 or 3" M66 Taurus and you'll see it is about the same identical size, a little thinner due to one less round in the cylinder. At 27 ounces, it's not a lot lighter than a 30 ounce K frame. The SP101 hides a bit better with the standard grip on it, but if it hurts to shoot, forget about it. For me, the Hogue is mandatory. It does have a round butt profile and hides IWB very well, though, anyway.
All that said, I love the SP101, it's a great gun, I just can't see buying another at this time, don't need it, got the niche covered.