Having ran/cycled/been up mountains in the Canaries before, I'm pretty well aware of the heat and sun, and whilst a concern, it wouldn't necessarily be a showstopper for me.

I think of slightly more concern is the altitude... 3550m is the highest point on the race. There's only 15km or so which is above 2500m, so perhaps 2-3 hours, but that's climbing steeply and then a hectic descent, I wonder if this distance/height/time-span is enough for the altitude to become a big factor...?

I must admit that having mulled this one over at the weekend I'm very keen...