Altamont makes a lot of finger groove grips which almost always fail to fit. If you buy some grips with finger grooves and know for certain they fit, then it could work out. Buying without knowing if they fit isn't the problem. The problem is if you keep using them unaware that they don't fit you.
The last set of Altamont grips I bought (revolver but not Ruger) had the grip screw holes in a diamond surrounded by checkering (a fairly common feature on checkered grips). The hole was not centered, but all the way off center so it broke the edge of the diamond. More troubling, the particular design I bought was not cut for clearance of the brass when it is ejected. It was utterly hopeless -- the brass would jam up on every single ejection. I used a dremel and sandpaper to relieve it. Ultimately, I found I could not get enough purchase with my dominant thumb to control torque from my support hand (not related to the modification I made). Right now I'm using Hogue, but I don't like the Hogue's palmswell because it's too low on the grips. I think grips are important to give a good "NPOA" and the Hogue do that very well. I also have a set of Pachmayers that are ugly and made with poor quality, not to mention rubber, but they seem to work well. If I could stand the sight of them on my gun for long enough, I could evaluate them better.
. I got two sets of Altamont grips for the Single Six/Wrangler a couple of weeks ago and they're a prefect fit and look great, too. 
