I like the CIEM to sound dynamic, musical and real, but still has great detail, air, layers and sparkle. Soundstage width isn't my primary concern, but I prefer a 3D space rather than a compressed one horizontally or vertically.
With my experiences and understanding, I think the most linear frequency response can produce that, especially the in treble region.
So before (and after) I own EM32, SE5 is still my favorite CIEM. I should say "my SE5" because of the various issues we have been seeing in 5 ways and because of its complexity of 5 way crossovers. I personally heard of more than 7 se5s (two of them are mine), they do sound different from time to time.
Stage 2 and 3 are the very those of few CIEMs that I really enjoyed after SE5.
So to sum up the "favour", my flavour is "no - flavour", the most accurate and neutral (in my opinion) CIEM will satisfy me the most