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.
“There is no such thing as a weird human being. It’s just that some people require more understanding than others.” - Tom Robbins