Metonitazene was around 2y a go from another EU supplier. There was problems with batch consistency so he gave up. But the people they had samples of working batch, confirmed its potency. Maybe is slightly below 52x analgesic, but anyway is really close.
From the first reports I had, a dosage of 1mg (no/low tolerance) to 5mg (f3nta users) do the job. The euphoria comes more from the partial action of this compound on Dopamine receptors, otherwise would be purely sedative. Anyway is probably the best "candidate" after Isot0nitazene. Sadly a big bulk got lost. The new batch will be out soon.
Metodesnitazene is trash, at least, for people looking for strong compounds. Got a potency similar to o-dsmt, but since no short/long side effects are known, I would not take unnecessary risks.
Etodesnitazene (Etazene) is the best for euphoria. Pure etazene should be close to fenta potency but who's selling (both the cut version or "Pure") is not selling pure.
There will be a 99% pure Etazene batch in 2 months. Main complain from people is about the super short-acting duration. But for me it's actually more than fine, since is not really something i'd use daily.
Fluo is on the way. There is an open dispute about potency of it. Wikipedia is not to be trusted. 25-50x were on mices. The compound, after i've spoken with a few chemist and checked some papers about Etonitazene analogues from 1933, didn't give enough intel to know what will be the actual potency on human.
If you are lucky, it will be around 5-10x, but if it will be recreational or not, you can just wait and sit to find it out. Could be it's < 1x as well, so totally a waste.
I'm just sick of all those Eto analogue, they don't get even close to f3nta analogues effects. I hope there will be a blanket ban so chinese will focus on one of the HUNDREDS other opioid with a relatively low potency but a super high euphoriant value / very recreational without ficking up yout tolerance.
If you want something decent, I suppose you have to do it by yourself. AP-238 came out as well. The name is just a codename, is actually still an analogue of AP-237 bit potency is around 4x. Could be an interesting alternative, but I'm concerned about both half-life and possible caustic interactions.