Bluesnews members reviews convinced me to buy it during the Steam summer sale.
Absolutely worth it. Despite being let down by the final boss, and admittedly needing a FAQ to get both through the game and get a couple secrets, it was a harrowing adventure. I am not one of those that was born to conquer these old school dungeon crawlers, my patience has limits. I don't want any more of the same that Grimrock originally offers. Vastly expand the environment, story and gear, you may get my attention.
One proud achievement was encountering an ogre for the first time (well before a FAQ) and beating it on the first try. That was sweet.