Here's my Slam Dunk North experience.
Arrived at the "festival village" at 9:30am, pretty poor - 1 food truck serving burgers (not really breakfast fare) and the bar wasn't serving alcohol till 11.
The Kerrang Tent - stank of manure and was a literal sh*t show, having one entrance was a nightmare and some of the bands in there could have been on bigger stages. However when you managed to get in past the crush at the entrance, the other side was pretty empty. I liked the idea of one band starting when another finished but it caused a ton of issues with access.
Was never really affected by queues, got food at a chicken and chips place pretty quickly about 1pm, the bars were quite quick even if the staff were a bit inexperienced/overwhelmed. Urinal queue was mental and I can see why folk were pissed off with the portaloo lines.
Sound Issues - I only really heard these during Millencolin where the sound was very poor, the rest seemed ok.
The place was rammed been going to Hatfield the last few years and this was mental, a bigger venue is needed if they want to sell that many tickets. We left before Offspring because we knew it would be insane getting out.
On another note my mate was travelling on the Big Green Coach from Edinburgh which never showed, was replaced by taxis and he didn't arrive until about 12:45pm
However I had a cracking day and saw some great bands, not sure if we will go next year unless there's some major changes