If it's not too prying a question to you mind me asking where you're based? Don't feel like you have to answer, since I know with this kind of site often so much as naming the country you're from can be too much of a personal give away - but if it's something you're not too private about I'd be curious.
Just wondering because my limited knowledge of the APB legality is in England and in Poland - in England as far as I know: 5-APDB, 6-APDB, 5-APB, 6-APB, 5-MAPB, 6-MAPB are all illegal - with the EAPBs ala MDEA being the only ones left legal. Here in Poland I think all of them are still legal but I've not seen any of the EAPBs pop up so far I don't think and certainly not 6-MAPB.
Note: I'm reading off articles and going on my own experiences and those of others, I'm fairly certain in what I'm about to assume but it's worth double checking and my word isn't the be all and end all, I could be wrong!
Having not tried it I can only offer speculation, but it's speculation with grounds in what we know already - so I feel fairly confident in my assumptions.
Here are the Ki values for 5-APB, 6-APB:
-------- NET -- DAT -- SERT
5-APB - (180) - (265) - (811)
6-APB - (117) - (150) - (2698)
(Lower = better)
- meaning 6-APB has a greater effect on norepinephrine and dopamine, making it more physically stimulating, and requiring a higher dose to reach similar empathy and tactile sensations to one with 5-APB (in fact if anything I think this is really where the quoted potency difference lies, as far as stimulation/euphoria go, dosages imo are similar)
It's expected that this will carry over to the N-methyl and N-ethyl analogues (i.e. 5-MAPB and 5-EAPB for 5-APB - and 6-MAPB and 6-EAPB for 6-APB). Now if we look at MDA, the drug 6-APB and 5-APB are both analogues of, and then at the N-Methyl and N-Ethyl analogues (MDMA and MDEA respectively) we'll see a trend, as the carbon chain on the amine gets longer, activity shifts from dopamine and norepinephrine to serotonin.
(-)-(MDMA)'s Ki values are: (704) (2425) (2306), and (+)-MDMA's are (398) (897) (948) so as you can see MDMA has a more balanced ratio of dopaminergic to serotonergic effects. 5-APB is heavier on serotonin and less stimulating, hence why people often describe it as "mongy and flooring" - and 6-APB is heavier on dopamine, hence the long rushing and partying all night many (myself included) can accomplish on the stuff.
Adding an N-Methyl to 5-APB, given that it should shift the focus further in the direction of serotonin is pushing it more and more in the direction of primarily serotonergic drugs like MDAI, IAP and the like, though still with its own euphoric push. 5-EAPB on the other hand sounds to me like it should mostly not be that revelationary.
Now with 6-APB on the other hand you have something notably more dopaminergic than MDMA, so add that N-Methyl group may just make for a very close MDMA analogue. 6-EAPB I'd also imagine would be quite similar to MDEA.
Personally aside from mixes I'd give 5-MAPB and 5-EAPB a mix myself (though for mixes I'm sure they excel wonderfully) but 6-MAPB and 6-EAPB should be pretty darn lovely. Sadly not had the chance to sample either though. Only 6-APB, 5-APB and 5-MAPB myself.