I saw it a couple of weekends ago. I thought it was pretty good, but about half the group I went with weren't huge fans.

The acting is great (as you'd expect), and I thought the historical aspect of it all was very cool. It had some good action in it (the sound of the thompsons made my pants tight), but it was pretty spaced out. The main complaint of the friends that didn't really enjoy it was that the pace of the movie was pretty slow (true). The movie definitely could have been cut down on time a bit, but this didn't really bother me because I can still enjoy a slow-moving story.

I'd say it's definitely worth a watch, but I'd probably recommend waiting for the rental.