Thieaudio and longevity/repairs?

I’ve been considering some of the more expensive Thieaudio sets but I have real trouble finding out anything about how they perform after you’ve had them for a few years.

From what data there is, it seems Linsoul outright refuses to repair older sets, so I’m having second thoughts about the whole thing since spending $1k+ only to have a driver fail after 2-3 years and then be stuck with it would suck and is quite contrary to other areas of electronics (computers, laptops, iPads, phones etc).

Has anyone owned any of their higher end models for a long time? What has been your experience?