I purchased a very clean Rolling Thunder PCB from @hidaniel and am very happy. Board was carefully packaged in a ton of protective bubble wrap. Seller was fast to reply and ship. Great transaction!
Couldn't find a more recent feedback thread, so hopefully this is the right place.
Ordered some MVS carts and a Naomi cart from @hidaniel. Everything went smoothly, and all the carts have done fine in all the testing so far. Hidaniel was great at setting expectations for timing (read the sales thread OP carefully!) and sent status updates along the way.