It's not a beta... its an early alpha... (yes, curiousity got me).
but it was built 4 days before it was suppost to ship.
It's not even close to a game.  A few of the levels have monsters in it.  Gamma settings don't work (lockups are pretty common) so you have to cheat to get the flashlight.  
So I turned it off and deleted it so I didn't ruin the game... just to see it in a completely unplayable state.
btw, there isn't a chance it would have been ready anytime soon... unless there was a very different version out there.  Then engine looks done, but very little of the game itself.  
but most important.
it runs GREAT on a machine that is affordable.
ati 9500 (bought year+ ago for 150... and I turned OFF the 9700 pro overclocking for testing).  on a 2ghz athlon was VERY playable.
Don't upgrade for it.  you probably wont need to.  I didn't try to run it on my other computer before I deleted it (2.4intel with a geforce4mx... sorry)
but it WILL be cool visually... the question is if they will do a good job on the game to make it fun.  The beta isn't fun.