I wrote it up for Arrivee a while back (copies available if you PM me). It's a fab ride and I enjoyed it a lot more than the Beast, which I've also done, athough the latter is more even. As Ian H says, the second stage is challenging (but the first is a doddle, provided you're not singled out for the attention of the notorious buzzard). If you time it right, the night section along main roads is exhilirating. I found the last leg the hardest but that was down to poor food intake and punctures. I'd not risk it as a PBP qualifier if you haven't done it before, but I'd say it's the most enjoyable 600 I've done.