The wood grips on the SAS are nice, but a little blocky. It didn't really bother me, but after reading a couple of threads here and there about Nills grips I decided to give them a try. I figured if I didn't like them it would be easy to sell them for what I paid. Well, I received them in the mail the other day and immediately, after a not so quick trip to Home Depot to get some star bits, but of course they didn't have a strip with all the sizes like they did for the phillips or flat head or that square one, NOOO, I had to buy a whole freaking kit. . . oh, sorry, where was I? Anyway, I removed the old grips, cleaned the main spring and frame and snapped on the new grips.
The difference is subtle, but significant, if that makes any sense what-so-ever. The Nills grips don't make it that much thinner, but enough to notice. The gentle palm swell gives just the right amount of contour that the gun now seems nestled in my hand as opposed to me gripping a block of wood. The checkering on the Nills is also more aggressive than the factory grips and so offers a better purchase on the gun while firing.
So, while the price of the Nills is steep I think it was worth it. I do fear I may have the new car syndrome with them though and will be diligently trying to avoid any sort of scratching or bumping until that first ding. Once that is out of the way I think they will hold up just fine.