Folks that I have chatted with share that the custom shop experience is about you customizing the guitar to your specs and color but not a lot it put into being particular about the woods pieces that are selected, you also have someone who is working to be a Master at some point. The Masterbuilt Custom Shop is where you have someone who is particular about wood selection and minor details. Also their experience in building a guitar. The custom shop luithers are working to be Master at some point, we all have to start off somewhere, right?, so you may end up with a guitar built by a future Masterbuilt Luther who just hasn’t reached that level yet. Sounds like the only difference between a USA and Custom Shop is spec-ing it out to your liking but I would like to hear from all the experienced folks here. I wonder if you can hear the difference and/or feel the difference? Cheers!