Here is some of my experience with MXE combos, all research on top of marijuana vapour (before quitting, updated):
Researched it with MDMA+3.5 cubensis, dosed it during the second half but was still feeling residual MXE effects from the night before, noticed this because the trip was completely different from the onset, was a hyper intense experience, quite amazing, not terribly visual but incredible thoughts/feelings, was quite delusional throughout though, I mean it was an insane trip involving religion and all kinds of craziness, very good though.
AMT + MXE 4/5hrs in was incredible, difficult to describe but basically incredible euphoria, in a party setting, everyone talking about futuristic stuff, kinda made everything very sci-fi. The same night DMT was administered at the end, repeated vapes between several subjects, amazing feeling, goods trips all-round, BUT there was an interesting side effect of this, shortly after the DMT, people became concerned about having too much fun, discussion took a more reflective, contemplative, sombre tone and the wkd was over shortly after.. this kind of effect I've experienced before, and I consider it more of a positive reflection from the trip, it's like, OK you've had enough fun, time to look after yourself and call it a night. I would consider the DMT a trip killer at this level, almost.
Vaped AMT + MXE insuf - awesome again, preferred to eating AMT..no naseau, faster come up, faster come down... from my recent experience I think vaping AMT + eating MXE is the best way to go. No weed with this one. Awesome awesome, awesome.
Marijuana in space cake form - trippy, confusing, took me by surprise, went out to meet friends at a bar and frankly I shouldn't have left the house... glided down the street like the nun from blues brothers.
200mg MDAI + MXE - not bad for me and others, but some have had trouble with this combo, kinda felt to me as if it was going in different directions, but still felt great, had a very open night, strong em-pathogenic qualities. Must've been some dopamine activity here as it caused mild jaw clenching. MXE is probably a DRI.
Kratom + MXE again half way through, only a little bit though - all right, 2 effects overlap but this was not actually enjoyable for me, I felt quite a lot of CNS depression and generally the effects were basic, maybe more MXE would've been better, but it didn't actually feel that safe TBH.
10mg valium + MXE - very nice, more relaxed, less confusion, didn't keep me awake.
30mgCodeine/10mgValium/KavaKava/MXE - small amounts of everything, this was kinda super lovely actually, very laid back, super relaxed as you'd imagine but again, I could've been pushing things very stupidly with this, just posting my experience.
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gonna try soon: paneolus, phenazepam, ketamine, I may try 3meoPCE, I did NBOME-Mescaline recently and I think that would be a good one as well. I wouldn't do it with mescaline because mescaline combos have been f'ing disastrous for me, but NBOME-Mescaline has no nausea, a faster come up and lasts on 3hrs... it's like user friendly mescaline. Wanna do 2C's but they dont' come around here too often.