I've come across these before. The old saying applies. You get what you pay for. I don't like the bearings and I think some of the threads could have been a bit tidier. I also thought the feel of the starter was a bit hesitant but that could have been just a fresh item, I didn't investigate it much further.

I'd be interested to hear how you came to the conclusion that they are a better than the Spanish ones? Do you mean the casting is tidier or the material is superior?