If I may just offer my experience ...

I have the 110XL. Soon after I bought it I had focussing issues. Real weird issues. This was maybe 8 years ago or so. It turned out that Schneider had used a poor cement between two elements. I had to ship it to California (from Australia). Schneider were very reasonable about it all.

I reckon the 210XL could suffer a similar fate given that it will come from the same factory floor.