I was a lot more pumped for it before it came out, but really I don't find it that amazing. I love the shadows, and its better then not having them, but they truely are very glitchy and have way too many problems. They are pixelated beyond belief, cause lighting errors left and right on bricks, and it doesn't appear to be that well optimized for systems judging by all the complaints.
But, this is more like a beta test then a full release of a version. They of course have to adjust and make changes, and I trust that it will be worth it in the end. The only thing I really want is for lighting to not go through bricks, which they still do in most cases in this update. But, they also said that they would be able to fix more things like that with terrain gone and shadows implemented. So I think time will tell.