The MEST MKII are by far the best IEMs in my collection. I parse their use because my other 5 pairs pale in comparison. All of those IEMS are priced btwn. $500 and $1500. One of those IEMs sells for exactly the same price as the MEST, I won't mention the brand, but the sound just doesn't have the amazing separation and detail of the MEST, not by a mile. I did a bit of tip rolling on the MEST, and the included Azla Xelastec (size M for me) hit the sweet spot. Only drawback, and it's slight - is the cable... a little primitive for my taste, bordering on stiff, especially the molded over ear loops That said, I'm still using it. I'm lazy. Lazy, and incredibly happy with MEST MKII.
fyi: Classical music is heavy in my rotation, so symphonic separation and instrument timbre is incredibly important to me:. The MEST delivers both sublimely.