First day it hit me in the heel.
Second day, the same.
Third day I put a blister plaster and it didn't hit me particularly but it bothered me in the toes when going downhill.
Fourth day, the same.
Fifth day, the same (maybe slightly better..)

Every time about 5-6 km,
70-30 walking-running,
50-50 on asphalt and dirt respectively.

Positives:
The feeling of how it hugs the foot.
It is quite lightweight.
It has a very soft sole and you can tell as soon as you wear it (if you bend it with your hands, you think it's harder).
The most positive impression, however, is the feedback it provides, especially when running.

Negatives:
Quite narrow fit.
The waterproofing, in wet grass from last night's rain, within a distance of less than 1 km, I felt the moisture passing through my foot, but the socks were not particularly wet, so maybe it's not such a big issue (it will show in the rain how it will be).
They slip on wet hard surfaces, e.g. stone. (although I think more or less all shoes do)

P.S: They fit like a sock.
If I were to buy them again, I would get at least half a size bigger (if not one)