Here's an update:
The piece was ...ok. It felt very thin. I took my fingers and stretched the weave to see how resilient it was, and it felt like it was going to tear (but it didn't). There's nothing to distinguish it from any other ultralight wool piece I've tried. I have Smartwool pieces that are less itchy next to the skin.
The zipper was unusually large and heavy. I would have preferred something much more minimalist.
The color was pretty hideous, but that's personal. I had the green and orange.
The sleeves with thumb loops were in an XL, but they came down only barely far enough to give me a full range of motion, and my 6'2" height is all legs- my arms are not that long. Also, the ends were very open, so it made me look like I had two big rectangles for hands.
Overall, for a baselayer piece that costs $150 I was not impressed. I sent it back, and I'll just pick up something on sale. Maybe my eye isn't discerning enough, but this brand (which I believe is from Belgium) seems to be more about style than quality.