Good to hear.
I bought a Duo off him like 6-7 years ago, it was DOA after a couple of months, I sent it back at his expense and he found it had another mainboard flaw. After discussion he sent me a Duo RX as a replacement, all free.
When this furore started up I opened mine and had a look inside, and saw perfectly acceptable work, certainly better than I would have done, a bit of epoxy. It’s lasted all these years without a hitch.
Yeah modding has improved a lot in that time with all these custom made PCBs. I’ve been slowly re-doing all my own work with new parts, did the N64 again, and I have a new amp for my Super Fami Jr to replace my home made one.