Just got mine tonight. Two week turnaround, which is great.
The fit is amazing -- they feel just like the impression I had made. I suppose that's the idea. (Bizarrely, the audiologist I went to in Chinatown had just made impressions for another guy who was buying the 13s. Small world.) All I have to do is rotate them, and they lock right into my ears with a perfect seal. Wow. It's much easier to get these in than my UM3Xs and e500s.
Haven't had much time to listen yet...but I have a few hours tonight to try them with my Pico amp/DAC. Radiohead's In Rainbows is the test piece.
The new Otter case is nice -- not too big, yet solid. It's almost big enough for my iPhone... That would have been cool.
And yes, I did sell my HD800s and SR335i's in anticipation of these. I love the idea of having a mobile high-end setup: laptop, Pico, JH13s. When I'm stationary I like to listen to my speaker rigs. Not sure what I will do with my UM3Xs, but I might keep them for casual listening when I might need to remove them quickly.