Been to i37, i40, i43, i46 and will be at i49 this summer. They have definitely got much better over the years, the current venue of the Telford International Center handles the event alright, they still try and wring every last penny out of you for food/drink, but at least the facilities have been clean and fully functional (showers etc), a vast improvement over Newbury.
Exhibitors are a lot better of recent years, even OCUK will be there with various staff from the forums. In previous years there was little to do but game at your desk, thankfully there is now loads of extra stuff to do during the day.
Try and go with a load of people you know, the majority of LAN time I spend just having a good time with people I see once a year, doing stuff like BBQs by the tents, chilling in the bar, going out for a meal, and the epic Pub Quiz that Multiplay put on. Gaming gets squeezed in there somewhere
Everyone who is there has a common interest meaning you can spark up a chat with anyone, people are all friendly other than a select few, but you can spot those a mile off, and they're generally the ones who won't leave their desk all weekend (not even to shower) due to being glued to CSS on their screen.
Peronally I take a desktop and don't really compete, have friends that do (and came second in LoL last summer) so just enjoy supporting them instead.
Give us a shout if you do decide to go, if any others do then could have a mini-OCUK meet at the bar one night
Any questions just ask