We hadn't been before and we LOVED it - no problems with teenagers, but we were in the Tangerine Field, where the rowdiest thing was my dds tearing up and down the hill playing bubble gun wars with their new friend
.
Highlights for dh: Blondie, PieMinister, lots of the folksy acts on the bandstand, constantly bumping into Jo Whiley 
For me: Singing along to Valerie and dancing like a loon to BangBangBang with the dds during Mark Ronson (swoon), lush breakfast at Henry's Beard Cafe, the randomness of Howard Marks and Keith Allen telling fairytales at the bandstand, the showers and toilets in the Tangerine Field being really pretty good (sorry).
For dds: The House of Fairy Tales - plain awesome! Dick and Dom - very funny. The Gruffalo, the expensive fairground rides
, the churros with hot chocolate, Sam Sam the Bubble Man (and bubbles in general) - pretty much everything.
Disappointments - they'd run out of fancy eyelashes and CB T-shirts when the dds made up their minds they wanted them, rude people blocking everyone's view of the stages by standing/putting up picnic chairs (wtf?).
We're definitely contemplating a return visit. Wish I'd made it to the Silent Disco, the Black Dahlia, Cocktails and Dreams, the Dingley Dell trail - but we had so much to do we couldn't do it all.