I notice there are routes, maps and profiles including (clickable) POIs on the site now, very nice
You've beat me to it. A draft routesheet & GPX files should be available very soon as well
The one that's giving me the heebie-jeebies is Leg 2...
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That's the hard one I reckon. Leg 3 has the big headline climbs of the Elan Valley, Gospel Pass and up past Llyn Brianne but also some easy bits in between. Leg 2 otoh is just all either up or down, and often quite steep to go with it - think K&SW600.
Leg 4 looks brilliant.
Last 100k is all downhill after the top of Pumlumon