What's the deal with Underworld LARP?

I haven't seen a whole lot about it, and I'm curious. I've read the rulebook, and it looks a little archaic, but not unfun. I've googled them And a lot of the articles are fairly old. There's been a few relatively recent posts here, but most of them looked like they were posted by the same person with a hate-on for the game. I just don't know a lot about it, and was hoping you fine folks had some insight, in either direction.