The best festival I've ever been to (out of about a dozen including Werchter and Lollapalooza Chicago).
Special thanks also to all the Spanish people who attended. They proved to be very civilized and happy people. During the 4 days I didn't see any fights or misunderstandings whatsoever.
A few points to improve for next time: Fix cashless online top up which was unavailable after 1pm, announce transport info earlier and provide more wifi spots around the site.