It clearly still has some work to do (hence why smartphone browsers aren't automatically redirected methinks), but I'm really glad that we're getting better support for mobile devices.
I don't bother using this site on my phone (Android 4.1.2) because it's hard to navigate and also the text area behaves strangely (auto-capitalisation and auto-spacing with Swype don't work for some reason).
I use the default safari and chrome browser on mine. I very rarely use it on my mobile devices, besides my iPad, because it is very hard to navigate. I hated the auto-capitalization too, so I turned it of :D.