I chanced on this on Blinkbox. It wasn't what I expected, in fact it was much, much better. I thought it was going to be some tacky gangsters versus vampire film (which I would have been OK about). Instead it was a who-dunnit/locked-room mystery. Even if everyone in that room are worried about a vampire who is killing criminals. Witty dialogue, lots of plot twists and some decent acting. Very stylishly directed as well.
It is definitely worth watching, and I say that as someone with absolutely nothing to do with the production.
I'd say more, but I enjoyed the way the story developed, and I'd hate to spoil someone else's enjoyment.