I've purchased two cutterheads for different tools from Findbuy and they both shipped from China and arrived inside a week to southern WI.
Overall machining quality is good with smooth surface finish, tight dimensional tolerance on the shafts I measured, and no burrs. Cutters locate properly and do not leave ridges from sitting at different heights. You still must take care when replacing/turning the inserts, working clean, but I have had no issues.
Bearings are unbranded but feel good and do not make noise. Time will tell with them, but I don't find them suspect.
The first cutterhead I received was made incorrectly and had the wrong pulley journal size. I contacted their support and inside of two weeks I had a new cutterhead at my door with the correct size. Obviously I would be nice if they had gotten it right the first time, but they took responsibility and made it right. They also updated their G8 style cutterhead listings so have realized the error and corrected it. Ultimately it came sooner than I would have gotten the part from the main US competitor that makes to order, keeping no stock, and also manufactured in Asia.
Cut quality is typical for helical carbide heads, which is to say very good. It does not completely eliminate tear out in all situations, but in most cases the surface finish is near flawless. Minimal sanding with higher grits will remove the slight 'scalloped' texture. Not only do the inserts stay sharp a long time, but you basically never have to adjust the outfeed table again. You can dial it in to eliminate snipe while still jointing true.