I signed up for the sheep it thing and put some projects on it. Nothing has rendered so far, still in queue. I also tried out the client, it's a resource hog (as expected), but overnight I apparently rendered like 500 frames or something.
I got impatient waiting for my own though. So I tried it myself. Luckily for me, I work as a monitor in my school's computer lab, so I have access to about 20 brand new Macs.
I just rendered out different sections in parallel on about 8 of them and it worked pretty good. Took maybe an hour to finish it all.
The reason I needed it that big was to sell some prints and other shit on Redbubble. The faq said to be safe, I needed something at 13500x11462 pixels to fit everything (a bed comforter set). I highly doubt I'll get anything like that sold, but in any case it might be some extra cash for steam games.