A budget carrier in the same "class" as Ryanair and Flybe and I think bmi baby. (if you know them). Usually cheap if you fly offpeak but can work out to be virtually cost as other airlines if you travel at peak. They tend to schedule their planes heavily, so their timekeeping record isn't as good as others and (if you watch the "airline" program on TV) you'll find they're not as helpful / understanding / sympathitic if you turn up late / drunk ...
I've flown with them, and would again. I've collected customers off their flights, and they've been happy with them too.
Hope this helps .... other views, anyone??