I'll chime in with my experience.. I've had the JH13 FP since August of last year. I ordered over the "4th of July" sale. Had impressions taken (I've had a number of custom IEMs before the JH13, so I'm familiar with the wait times and requirements for quality impressions) and sent them off a few days after the 4th. Lead time on my JH13 was almost exactly one month. I didn't get an email for confirmation that they received my impressions (nor did I request one.. I just followed the USPS tracking on my impressions).. one month later, I got a FedEx tracking confirmation email. The fit was terrific and they sounded great.
About two months ago, I needed the fit on both my ear piece slightly adjusted.. it just felt a tad loose. Nothing was wrong with the original fit, just perhaps that something changed in/around my ear. I emailed JHA and asked if they could facilitate a refit w/ new impressions.. even though my pair was out of the '30-day refit' period. I got an email back from Johnny @ JHA in a matter of days (who was very nice).. who said it wouldn't be a problem and asked I send my JH13s and new molds back to them. About two weeks after they received my IEMs/impressions, I received another FedEx tracking # and my JH13's back in a matter of days after that.. fit was perfect again. I wasn't charged anything for the refit.
About two weeks ago.. I.. like an idiot.. accidentally dropped the right ear piece in a cup of iced tea as I was removing them from my ear. I was able ot fish it out almost immediately since it was still attached to the cable, but after trying the whole "toss it in a bag of rice" deal, the bass was completely non-existent in the ear piece that got submerged.. so I'm surmising a driver was damaged. I informed JH Audio (by email) of my foolish mistake.. and within a day or two, received an email back saying the same thing, "just return your JH13 and we'll take a look." I sent them back about a week ago and received an (un-prompted) email from Sue @ JHA who informed me they received my JH13 and will be taking a look at them soon. That's where I'm at now.. waiting to hear back from JHA. I know others haven't been as fortunate as me, but my experience with them (so far) has been nothing short of terrific. They've accommodated a (timely) refit that's far out of the 'refit window' for free.. and might even repair one of my JH13's ear pieces for free (again, in a very timely manner). I'm not a musician or any other type of customer that might get 'preferential' treatment, either. Just a regular old Head-F'ier. Will keep everyone posted on what I hear back.. but so far, I'm very happy with my JH Audio experience.