A rebore from JES is about $300 and the lead times are 3-4 weeks, from what other customers have said. A prefit barrel from most barrel companies will be in the $600+ range with 3-6 months for a wait time. Half the price and 1/3 the wait time sounds pretty appealing.
I've heard the same thing from others about the bore condition after the work was done. Those folks were happy with the accuracy, like you, so they weren't worried about it. I've seen some pretty ugly barrels that shot great, so I don't get too hung up on that. It's a good thing to be aware of though.
I haven't heard that name come up before. Do you have any info on him?