I saw the movie yesterday and it was surprisingly good.
I expected to be bored, but the movie is shot with such an intensity and urgency that it kept me watching, even though I pretty much knew what was going to happen next.
Foster did a great job channelling the narcissistic and ambitious Armstrong.
Of course, any rider or person familiar with cycling will cringe in embarrassment while watching the race scenes, but that is pretty much to be expected. You could drive a small truck between riders in the peloton, and some are wobbly enough to appear drunk. (Ok, that's a slight exaggeration; but let's just they didn't exactly look like Nibali out there.)
Also, Ferrari's character is so over-the-top evil that I initially found it funny; but those are mere quibbles.
Obviously no one here is going to learn something they don't already know, but like I said, it was better than I anticipated.