That scares me lol. I like vocals either balanced in the mix or slightly forward. One of the main problems I have with the Arya is that I find the vocals (and mids) kind of recessed; one of the things I like (really like) about the Blessing2's is that both are more forward without being shouty (at least with the right tips). The MEST are supposed to be more vocal oriented while also retaining a good sound stage.
I have little doubt that AME's offerings are good to very good, but considering the price new for the IEMs I'm interested in (I do hate to buy used), and the relative lack of info. about them compared to UM IEMs, particularly the MEST, as well as the price of a new MEST, the choice for me is fairly clear.
I also want to try the bone conduction tech. as one of the things I dislike about headphones of all sorts is the lack of
feeling the music such as one gets with speakers. I'm not a basshead, nor do I listen to music particularly loud, but the visceral feel of sound waves at even low to moderate volumes really helps immerse me in the music, making it more "real".
Thanks to all commenters in this thread, and if I am disappointed in the MEST and decide to try an AME in the future I'll be back!