Just got back from seeing it today (spoiler free content).
I liked it, I have to say that it was better than I was expecting - there aren't many bum notes and I'm not going to discuss them until more people have seen it, or else you might be looking for them. I thought the casting was mostly excellent.
The violence is quite graphic, really quite brutal in places, especially the bit where Dan and Laurie fend off some knot tops - the original tends to downplay violence by not doing the standard dynamic movement seen in comics so when translated to the screen it's quite heavy.
There was one biggish omission but I would expect to see that in the extended version.
I liked the ending too, again, can't discuss that yet, it made sense though.
Looking forward to the extended DVD now.