I just finished my 3 weeks binge on this substance (ie. redosing every 40 minutes, or every 3 hours of sleep when I was woken up by the withdrawal symptoms).
I'm now stopping because it cost me way too much money I now owe to my financial institution.
I'm starting the withdrawal, it seems more symptomatic than my previous kratom 4-year addiction withdrawal (particularly the RLS), or maybe I don't remember well enough how bad it was.
The worst symptom during all my previous withdrawals has always been RLS, seems to be no different this time. Cholinergic symptoms (tears, runny nose, yawning) were quite intense in the beginning compared to my previous wd, indicating that U-47700 is quite anticholinergic. Those seem to have faded for now, I'm not sure if it's due to my wd cocktail or not.
I'm currently using my usual withdrawal recipe (Etizolam, Gabapentin [magic for RLS], Imodium, e-cig and weed) and it's working quite well (as of now) for the U-47700 withdrawal.
I will edit this post in the future if I find out new particularities of the U-47700 withdrawal.