In fact, when you play Descent 2 and discover that...
You should not buy second-edition Descent. I think I can make my case pretty clearly for why you definitely should not get involved with this game.
For starters, Descent 2 is addictive. If you buy Descent 2, you will want to play it. And if you play it, you will not want to stop. You will be sitting in your living room, watching a perfectly good television program, and you will say to your friends, 'I think we should turn off this show and play Descent, because we all know how much we love it.' And do you know what will happen? Your friends will agree. You will never find out if Joey marries Jeannie on the uncharted island. You will only find out if Splig the fat goblin king manages to make off with the shadow binder.