At present I wear Berghaus Superlite 2s, full leather and light. This is my second pair. My first pair, when they were made by Brasher, was tried and tested before I too hiked the GR10. By the end I had worn them out. The inside leather cracked at the toe end in both boots and made my toes red raw and sore. I threw them away and finished the hike with a cheap pair of trainers. My present boots have shown no such problems, they fit me like a soft pair of gloves and with my Sorbothane inserts under my feet I love em!
The boots work well with my Rab gaiters. I wear them underneath my trousers, bit odd maybe but I still get wet feet wearing them on the outside this way, for me, solves this problem. I hate wet feet!
The boots main weakness, as with most brands I assume, is that they can be slippry on wet rock surfaces. No real problem, I'm just that bit more careful, especially when stepping, or jumping across wet and large boulders in particular. I once flipped straight on my back when going down a chaos. My rucksack saved me thank goodness or I would have done serious damage to myself.