What are you guys on about? 5-APB is almost indistinguishable from MDMA, perhaps a little less speedy but sometimes MDMA can hit you with major couch lock as well. 5-MAPB I haven't tried but as it is both chemically even closer to MDMA and a prodrug for 5-APB, I'm very surprised if people find it very different.
You probably do not want to mix 4-F(M)A with 5-(M)APB because mixing highly dopaminergic substances with MDMA is a recipe for neurotoxicity, and it is very likely that a 4-FA and 5-APB combination is no different.
4-FA is similar to methamphetamine imho. I do not find it similar to MDMA any more than meth is. Unfortunately, it also gave me nasty flashes of intense dysphoria, and gave me a miserable comedown even though I was taking small doses. Much worse than MDMA that has always given me a gentle afterglow where I miss the rush but don't feel depressed.
MDAI is reportedly quite useless. It was a chemical that looked good on paper but in reality did very little.
Having said all this, I must warn that some new data is coming out suggesting that 5-APB and the other benzofurans might be cardiotoxic because of their extreme affinity for the 5HT2b receptor, much much stronger than MDMA.
MDMA has been used reasonably safely for decades. Why take a gamble on some largely unknown chemicals just because of some government regulation? Do you really respect their opinion or their ownership of you and your body? If you want to take MDMA, just get some MDMA.