FWIW, I was just talking to Costco fitter about the M&RIE (for my probable upgrade from KS9 to Jabra Enhance 20) and he suggests not - his experience is the in-canal mic clogs and clears too much in most people and results in localization artifacts (he made in/out motions at his ear like a trombone player), says most get returned. Another Costco fitter (same store) said too many people find them uncomfortable. Both agreed “great in the fitting booth but often a failure in the real world”
I also asked him to distinguish between the Jabra and the Phillips and the Rexton and he summarized to: Jabra wins for most speech clarity in noise and for app control capabilities (“it’s like driving a stick shift where the others are on auto”); Phillips is better for musicians/audiophiles (“amazing for music”); and, Rexton is for specialized situations (“like after facelifts where the pinna lies really close to the skull”)
But before he sells me the Jabra 20 he wants to redo the hearing test and REM/setup on my KS9 then use that test to set up the Jabra for compare: “don’t want to sell you something that isn’t enough better” and he pointed out “you get 6 months to return”