I think it's worth remembering that the 5-APB series are more selective for serotonin than the 6-APB series, and just as with MDA -> MDMA -> MDEA that selectivity for serotonin and reduction in dopamine release continues as the chain on the nitrogen extends. So 5-EAPB should be between a pure SSRA like MDAI and something like MDEA in effects, and that's what it is.
I think it's nice, and it goes excellent in mixes. 70mg 5-EAPB + 25mg Amphetamine (with redoses of the Amph) makes for a great night similar to MDMA but longer lasting. 5-EAPB + LSD is absolutely serene and magical, and 5-EAPB + MPA is a decent roll that feels something like 5-APB or 5-MAPB.
High dose 5-EAPB + 6-EAPB on the other hand was a combination I wasn't prepared for, admittedly I dosed way too high with both compounds (>150mg of both, when I regard 150mg of either to be too much to begin with) - ended up having a 24 hour rollercoaster ride of a trip from hell. At lower doses (60mg + 60mg for example) the mix is lovely, and lasts a long time.