as far as arete's go its pretty wide and (as far as I'm concerned) there is no real exposure at all. I would argue that Crib Goch is "harder" in that it is narrower in places and therefore more exposed. I would say its on a par with Striding Edge but a bit longer; mind you its better than striding edge, in terms of the surroundings.
when we did it last year it was pretty windy and that didnt cause us any concern at all; I would have been more concerned being on many other ridges