I have one - it's the portuguese version with no subs, but you definitely get the emotion. Buy it, seriously.
Amazon UK is selling the full-boat bluray (not region coded, and with English language/subtitles) for <$30 shipped; mine is on order already. Haven't seen a release date for the US version yet, but if you have a PS3 it's a no-brainer. It's actually cheaper than listed, because you don't pay VAT.
http://www.amazon.co.uk/Senna-Triple...5362131&sr=8-2