The A105M is made in Japan, as is the 81M.
There are also cheaper models they outsource, which are marked by the letter "f": e.g A80Mf, ED80Sf (I have no proof, but this could be a close kinsman of others 80mm f/7.5 "CHinese" doublets).
The R130Sf is also outsourced.
The only models I could remember that are outsourced but not labeled with the "f" are the VMC95 and 110.
My experience with their outsourced stuff is that should not expect a dramatic upgrade from Skywatcher/etc...as an example I have both the Skywatcher 90/1250 MCT and the VMC95, and both sail the same boat (not an especially nice boat).
As for the 105M, it never struck me as an especially good deal. The day I wanted a mid-focus achromat ended with the purchase of the TAL100 which, while not so fancy as the Vixen, is in any case made to last and, unlike the A105M, came with really nice accessories (TAL eyepieces are as good as the Volcano-top orthos, the finderscope is excellent and I prefer it to those of the Taks due to better ergonomics, and even the diagonal is very good, to the point that I keep using it even with other telescopes. To get a meaningful upgrade had to go for the BBHS mirror).
I got mine brand new for ca 300€ (299+shipping) and developed an healthy respect for the brand.
In truth, were to pay over 1000€ for a 100mm, I would look into one of those rebranded "APOs".
My first "serious" telescope was a Tecnosky 66/400ED, made by LongPerng and rebranded by a reputable Italian vendor: the reasons behind it being sold at almost one third of the price I paid for the FL55 are quite obvious, but despite a feeling of false opulence, there is nothing really bad about it (I even pried its lens through a Ronchi eyepiece, and the result was a very decent correction of SA, even if nobody could mistake it for a Tak).
When I made the purchase I was just lucky (Tecnosky was the shop closest to my home), but had I asked to more experienced stargazers they would have likely pointed me toward a trusty vendor as the safest course of action. If the vendor selling you the stuff check and allows only to those reaching the threshold of decency to leave the shop, then are somewhat shielded by the worst.
Obviously nothing could be done about design issues, and my impression is that a fair share of the difference between the prices of FL55 and 66ED is due to unsavoury savings on mechanical parts, so the fact that am using the 66ED as guidescope and take the picture with the FL55 could suggest something, as the fact that I have still the 66ED after eleven years.