I have one set each of Sambar and elk.
The Sambar stag are on a 629 I've had for decades and have taken on a lot of color from my hand, solvent and whatever else they've been in contact with. When I got them I carefully fitted them to the grip profile - they haven't shrunk or warped at all over time. Generally I prefer wood, but these remain my favorite grips on my favorite handgun. They are shaped like Magna grips, so I use an aluminum Tyler T-Grip adapter with them.
I have one set of elk grips by Grashorn. They were shaped a bit oversized too, so I touched up the profile to fit an old Model 10-5 snubby. Next to the Sambar they looked far too new and clean. They have nice matched bark and appear more porous than the Sambar, but are lookers nevertheless. I think the porosity means they may not polish up over time as nicely as the Sambar, but I don't expect to use, carry and shoot the Model 10 as much as I have the 629 either. Just the other day I moved them to a nickeled, long barreled 10-5 that will probably end up in an old buscadero rig hanging from a bedpost. They will look great there. In all I think the elk are an excellent deal on great-looking grips. I figure they're probably more durable than most woods too.
Someplace here there should be a comment on proportion. Putting expensive grips on expensive guns is reasonable. Putting less expensive grips on less expensive guns is reasonable too. That old 629 has a lot of my hand work in it, a lot of rounds through it and remains my favorite handgun ever. Maybe carved ivory would be overkill, but Sambar makes sense. The Model 10s are just revolvers that caught my eye and were priced right. Spending the money for ivory or high end Sambar might be overstating their worth. Elk is an excellent compromise, not breaking the bank yet looking and feeling good. I like having the option.
-Don
P.S. Here's the Model 10 with elk grips:
And the 629 with Sambar stag, well aged: