For me, based on my priorities at least, the festival was excellent.
Line-up - For my taste, without question the strongest of any festival I've been to and up there with the best I've seen on paper. Saw a good 15 acts that I wanted to see - none of whom disappointed.
Booze - Bars were busy, yes - especially on day one, but any beer drinker with half a brain would have hunted down a quiet one (left of the main stage for instance) or even better - the mobile beer dispensers found en masse near the ferris wheel. We didn't wait more than 2 mins for a beer with these guys.
Sound/staging - Excellent. Usually like to park near a speaker especially when big screens are up and did so for most of the major acts, the sound was exceptional. Was a bit closer to the front for Arctics and the sound still didn't disappoint. Sound in The Loop was a good as any dance space at Glastonbury which is always a benchmark for me. Was easy to navigate between stages and there wasn't any noticeable sound bleed.
Weather - speaks for itself.
Location/organisation - We were in central Madrid and the festival was 20 mins on the train or the same by cab, €30 one-way split four ways isn't an issue. The queue on the first day was a joke, but they sorted it. For the next two days it was easy to cut in between the main entrance and Valdebebas station - we were in in about 15 mins on the other two days taking this route.
Vibe - had a Glastonbury-like feel in terms of how chilled the vast majority of people were. Staff and security cool too. No fights, no bother. Think us Brits were probably the only drunk people there.
My days of being crammed in at the front of festivals are over so can't say the VIP bit bothered me too much, that said, having an empty area in front of a stage seems a bit stupid. The queuing issue on day one was unacceptable. Other than that, it was a great few days - we had a brilliant time.