I wear injinji socks almost exclusively all the time, not just for hiking. I love them.
I have found the toes on the bamboo ones I tried were too long and bunched up painfully. I have never had any trouble with the wool ones.
I wore a pair on the PCT last year for about 600 miles before I decided to switch to a new pair. There was a small hole.
I have found that you can wear the liner socks on the outside with injinjies. Either thin ones or consider the injinjies to be the liners and wear thicker socks outside.

