I received my reshelled JH13 Pros today, and I haven't been able to take them out of my ears since they were delivered.
Shell quality is superb. They are definitely on par with JHA and UE.
At first, the fit of the right ear seemed a little lose, but likely because I was wearing my UE10 Pro customs that had inadequate fit all morning before I put the new pair in. After a few min., my ears adjusted to the new pair, and the fit is perfect. I'd add that getting a well made ear impression is very important. I moved my head around a bit, side to side, front to back, while the silicon was curing, and I can report that I do not lose seal when I move my head around with this pair. Matt also chose a good length for tips. I initially thought they tips might be a bit short, but comfort level and sound quality are both great.
Audio quality is great. I can certainly hear additional details and nuances on the tracks I've heard hundreds of times, which is in line with the expected improvement over my UE10 Pro Customs. I would say that the original sound signature of the JH13 Pros was preserved after the reshelling.
The turnaround time was 3 weeks. With Kaysen and Matt expecting a baby soon and also while being flooded with new orders, they managed to meet the turnaround time that I was quoted.
I am very satisfied with the quality of work and service from InEarz. As long as InEarz keep up their great work, it will make buying used CIEM for reshelling totally a worthwhile effort.