Grimrock was a nice nostalgia trip for an hour or so but it got boring and grindy fast. At the current price you can't lose, but I myself never finished it and never will.
I'm still holding out till Witcher 2 hits $5 at Xmas in a few weeks. Seeing as I couldn't really get into the first one I don't hold out much hope for this one either so it's going to have to be on the cheap.
“That's it. You people have stood in my way long enough. I'm going to clown college!”