I've been shopping for a fully carved bass and just played a new leftover 2017 shen 5/8 Sb300 that had gorgeous tone and showed no signs of any issues at all, he gave me a great price so I am purchasing it as soon as it's been set-up for me. Given that pros often tour w/ them I expect they are quality basses. I've looked for construction method links but haven't found any yet. I have played Uptons but they were heavy and not all that resonant to my ears, but every bass is different so....The luthier I am buying from swears by Shen and had quite a few used ones that looked like they've never had any issues. I've seen basses on his rather extensive repair shop bench so I'd say his good reputation has been earned.