I have to say, and have before, that I had the same problems with the KEF (first fit, then, when I got them to stay in, the Left side went out on me). It doesn't make them bad sounding, did like them the short time I could listen to them, but I've also seen more than 1 post about quality problems.
Onkyos are really nice iems, also said this before, but I don't think they get enough love around here, FOTM for a very short while (not close to the ink shed on the Pistons...I'm burning these, along with my replacement Gratitudes, like them, great buy for the price.
Mikros 90-great buy, period, not just for the price. Take the discount into account, really a steal.
May go for the mdr 7550s, the good doctor has good ears...
Just have fun, folks, "it's only Rock n' Roll, but I like it..."
GLAD you are enjoying a variety of IEMS esp the Gratitudes and headphone wise the Micros 90! Remember on the 7550s that they are a "studio" indoor headphone, don't seal out the wind or rain
and protrude a lot from your ear. the sound is clean and magnificent, not colored at al. the treble is slightly rolled off but still has sparkle, but isn't the WOW, apparently, of the mdr1000s, which are also 3 times the price
but made of metal but if you can get a 7550 under 200$ that you can audition and return if you don't like the sound signature, its worth the investment in time energy and money., perhaps a "discovery" for one doctor jazz!