Not to go against the current, but I CAN see a difference between my Swiss ETA 2824 and my Asian clone 2836-2. That said, the clone has not been serviced, as a prior poster has suggested. I expect that when the clone poops out and I have to serviced, it will beat just like the Swiss ETA.
And just to say it, the Swiss ETAs have been confirmed; they are not the franken-Swiss variety as alluded to in earlier posts.
So...I think your quality guarentee is to get it serviced, no matter what flavor you opt for.