Yep, I have a screen-used hero metal grenade. The operation is pretty basic, but cool. One of the small grey buttons depresses, turning the internal light system "on" so that when the top is popped, it counts down. I use it sparingly, as I'm not eager to try to replace the battery. Plus, I never know when a Reaver attack is coming.
Mike's sent me pics of a lot of his stuff, and it's nice. I definately understand what you mean about time vs. price, Mike.