I did search, and found mostly discussion on some defective early units, but not about its actual performance.

I'm wondering about its focus uniformity and chromatic aberration.

From memory it was a decent unit. A bit small for some projectors (aperature)...so it was a bit more limited in compatibility.

The U100 is the lens you saw on my RS1 2.35 HP Noah.

I have two of them if you want to experiment.