I don't know too much about it as I only decided to get into tri a couple of months ago, but although it is staged at Groomsport, it is run by my local North Antrim club, triangle tri club.
I was intending using it next year as a step up to iron distance, but fell in to the pirate way of doing things , so I'm now doing outlaw 2012 as my first. If things go well for me I hope to try it in 2013 as a training event for a later in year IM.
I loved this video, which isn't particulary funny but probably typical of the organisation in such a relaxed, low key affair. The kayaks were like beacons and everyone followed onto the rocks.
This year a friend of mine was mowed down on his bike, by a parked car. Head down and pushing hard!