We just saw "Russian Ark" recently, since we will be going to the Hermitage in just a few weeks, and wanted to get a preview. It's amazing, all right - since it's all in one take, it's exactly the way the world appears seen through your own eyes. The voices are at such a low murmur, though, that in the evenings after dinner, we'd doze off and realize we'd missed whole parts of it. I think it took us about a week to watch the whole thing!
I spent two days at the Hermitage didn't even see it all, its an amazing place.