Had a decent amount of this, 100% confirmed substance as well as quality 98% pure. Was given a recommendation of 20mg initial dose (insufflated) to start off with (after a 1mg allergy test of course

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Decided to go the safe route with the dosing as I tend to overwhelm myself by overestimating my k tolerance or by dosing large due to becoming accustomed to the shit quality of k in my area... I didn't want to put myself in a mental state I would have had trouble dealing with for (from what I had heard and read) 4 hours.
Did 10mg and found myself with some mood elevation and some slight dissociation after about 15 minutes. At the 20 minute mark decided to go for the other ten. This was an excellent idea. I found myself in a very silly headspace, giggly and slightly energetic but also relaxed, like I could sit on my couch for hours. Which I did. I spent a significant amount of time on the spacetribe website as well as elftrance.
I was fairly surprised by the sedation of my peers. Two fell asleep, while the other was doing incremental doses of MMC (actually MMC mixed with MDPV and sold as drone) as well as MEC mixed with MDPV(MDPV in this mix was unsuspected at the time) and small bumps of 5-methyl-MDA (or so we thought. Have since learned that the info on this chem is entirely unreliable and am waiting for a sample that is meant to confirm that it is entirely ineffective. I suspect he may have had one of the APB's given the description of effects...) Anyway, I digress...
Only the two of us really stayed awake for the entire length of the experience. I thought it was pretty, like the contrast and definition nob had been turned up on my vision. Unlike my experiences with k, which often leaves me overwhelmed, doing what I can to maintain my grip on reality as I switch from mental tv station to mental tv station, all playing the same show, with a different plot, and the same characters in different roles. Hard to explain, but that is the best I can do. MXE was clear minded, and easy to control. My movements were somewhat labored, doing the lovely K-walk (or M-walk i guess) to get to my deck and see the 'super moon' or whatever.
At this dose, it was manageable, entertaining visually and mentally, physically relaxing (the talk of opiate like effects are spot on). But maintaining a strange stimulation that lingered for quite some time after the other effects had dissipated.
Overall, I give it a 7 out of 10. Same place I would put K on that scale. I don't think it is a replacement for K. It does share effects, for sure, but it is also, by several first hand accounts, kind of like a thinking man's k. The dissociation maintains a strange level of clarity. The duration is excellent in a city where time from open to close of a club is often 10-2, just enough time to do a line before and be sober when the music stops. It also decreases the inherent risk of being discovered bumping up... And the actual legality of it, being a schedule 3 analogue, makes it zero risk and very favorable. But, it comes up much slower, making it useless as trailmix component as that requires the rush of both happening at once. It is not the immediate insanity of k, overwhelming if unprepared, it is gentler but this softness makes it less enticing for certain situations where extreme dissociation is desired. And, the long duration takes away that ability of k to almost be an anytime/anwhere thing because, well, you'll be sober in 20 minutes...
Upon some further experiments, I have come to the personal conclusion that MXE is a neurotropic. I feel as though it heightens the senses and allows you to see, hear, feel, taste and smell at an accelerated rate. But, your motor skills are still dampened like an opioid or ketamine. Most of the people who have tried this stuff have labeled it 'super k'. Not just because of duration, but also clarity and potency.
MY evidence for the neurotropic properties is one instance in particular (there are many other less apparent instances, this one just stuck out). I had done around a quarter gram over the course of 4-6 hours (estimate) starting, for the first time, from a sober mind. Near the end of my night, I was sitting talking to my girlfriend when I realized I no longer felt all that dissociated, even though I had done a 50mg bump no more than a half hour prior.
I explained to my girlfriend how I was seeing things clearly, like in real life HD. I felt as though I was processing information at an incredibly high rate. Like a cartoon character that has drank way tooo much coffee and is moving far faster than his peers, processing things and moving around at a superhuman speed. Think Fry from Futurama when he drinks 100 cups of coffee and saves everyone from the fire. I had a perfect memory of the day prior, before the trip, recalling dertails I personally don't think I should have been able to recall. I felt an incredible mental clarity. Almost sober.
After searching for a reason as to why this experience was so much clearer, and so suddenly clearer than any other, I honed in on one answer. I had drank a Coca Cola. Regular, Coke classic. With all that lovely sugar. It could not have been the caffeine, I live off that shit, I drink so much diet soda I am probably more preserved than a can of Smuckers.
The sugar rush was absolutely the most intense i had ever experienced. I was hyper alert, and responsive, essentially all the effects attributable to a sugar rush. Except they were amplified 100 times. It was extremely similar to instances of taking piracetam and another chemical and noticing the increased effect of the other chem.
This one is a winner in my book. It just needs to be treated with the same respect as any other RC. If people do stupid shit, they will hurt themselves. No different than anything else that nobody knows anything about. It is mildly frustrating that people seem to forget that so frequently on here. Ultimately, anything can be done with a reasonable amount of caution and safety. The problem is, people don't or won't listen or pay attention. Hurt, attention, labeling, monitoring, regulation, prohibition. I don't recommend anyone do more than 50mg of this at once, for psychological reasons. It could freak someone out if they aren't ready for it.