Wore a pair of them all last season. Included around 18-20 days of elk hunting and helping out for 4 days on a goat hunt in Colorado. Terrain was everything from aspens with grass and shrub undergrowth, to high alpine goat country. Was actually really surprised with how much I liked them at higher altitude with all the rocks and scree.
Can't say I ever hunted in anything too wet, except some decent morning dew, so can't really attribute to their water proof-ness. My feet did stay dry the whole time I used them though.
As far as durability, I haven't had any issues, which is great because I have went through one pair of Crispi boots relatively quickly and have heard several other accounts of people having leaking boots and peeling rands quicker than expected. I think the stitched leather rand makes a big difference on increasing the durability instead of a glued on rubber rand.
I went with the Crispi Colorado which has metal eyelets instead of cloth eyelets and has a full gortex bootie so my feet stay dry crossing creeks.My Thor I's and II's both have the cloth eyelet. Ive worn Thors for 3+ years now and havent had that issue with the cloth eyelet, but the way I tie them I dont wrench on them in that area. I tighten the lower section and just sort of keep that tension with the cloth eyelets, double overhand after that and then run the upper 2 and tighten again.
The Thor is probably my favorite boot, but may lose that status soon. If you like the Thor but want to get away from that cloth loop, try out the Hanwag Makra Trek (or Makra Combi, but I prefer the Trek). Similar feel and function to the Thor, but theres a lack lock in that spot instead of the cloth loop. The Makra Trek has a more flexible sole, but also has some protection over the toe cap, whereas the Makra Combi's sole is more in line with the Thors stiffness, but has virtualy no protection over the toe cap.
I went with the Crispi Colorado which has metal eyelets instead of cloth eyelets and has a full gortex bootie so my feet stay dry crossing creeks.