While I have owned several universal IEMs from various brands, I always felt I was missing something by not having a set of customs made.  I did my homework and started reading tons of reviews of all of the latest and greatest CIEMs on the market.  I kept coming back to Noble and the reviews of the K10 all seemed to say similar and consistent positive things.  So after finally getting impressions done and talking with Brannan, I made my order for a set of CIEM K10s.  Being the impatient person I am I paid the extra to have my set expedited, and even though they were done in lightening speed, the waiting was a killer.  Brannan and Sunny at the lab in China were amazing in answering my emails and both were exceptionally patient with me and never seemed annoyed by my being a pest in asking "Are they done yet?"  Finally I got the photos and they were gorgeous.  I choose a Wizard reprint with a few specifications for color changes and the pictures were amazing, but not even close to how beautiful my K10s are when they finally arrived.  Upon opening up the pelican like case I was in awe of these tiny little works of art.  I'm not sure how long I stared at them before I snapped out of it and plugged them into my AK240 to have a listen.  Well the sound is even more amazing then the K10s are to look at!  Everything I had read about the Noble Kaiser 10 CIEMs is true.  No matter what music genre I threw at them the sound was perfect.  Jazz and classical had instruments with various sounds that I had never heard before.  Vocals were crisp and balanced with the instruments.  I am not someone who has ever done a review with the technical words for IEMs so I will leave that to the professionals.  What I can say is that I have never enjoyed my music nearly as much as I do now that I have my K10s.  Music is just that much more fun to listen to.  I have other IEMs that are more analytic in hearing distinct instruments and vocals and if I am focusing I certainly have clarity with my K10s.  But mostly I just close my eyes and hear all there is to hear in whatever I am listening to and I am enjoying the music.  That is perhaps why I feel my K10 CIEMs are the perfect IEM.  Perhaps the only drawback there is in owning a pair is once you have them there is no going back.  I simply adore listening to music with these and there is no other IEM that I own that even comes close to the perfection of hearing the music.
I did have problems with the fit in both ears but particularly the left.  After sending photos to Brannan and Sunny I had to have another set of impressions made and send those along with my K10s back for a refit on each ear.  That was painful after listening to music with them and I had withdrawal until they were refitted and returned to me.  Yet again the customer service and communication was excellent and the refit was worth the wait.  My K10s now fit like a glove with no break in the seal no matter what I am doing and the sound is even better.  All I can say is if you are going to have one pair of CIEMs and want something that will give you musical ecstasy in addition to being a work of art, the Noble K10 is the perfect CIEM.