Yes its hilly and tough - the weather is normally not on your side, you'll also have to contend with a lot of walkers. The food/drinks stations are wierd if you're a runners cos all the walkers stop for tea and a chat, but they do have cake, mars bars and god knows what else.
It is well organised and I intend going next year, can't this a won't be in the country, once you've finished there is plenty to eat.
If memory serves me correctly you don't get anything for taking part orther than a certificate giving you your time.
If you need accomodation book it now as they're ain't much there.