The stuff doesn't breathe as well as other options, so it can get clammy. Personally, I really hate that feeling. Typical winter conditions in Seattle are 45 F and raining. Also, I use other stuff that works better for me, and costs less.

Agree 100 %.

Personally, I use: an Arc'teryx Accelero wind breaker jacket (almost every day, 6 months a year), a merino wool base layer, and if it's below about 40 F I'll wear a light insulation layer in between and a wool buff over my ears. If it'll get below freezing I bring a down jacket and wear it outside the windbreaker.

Gotta experiment a lot with the mid layers and temp and weather conditions.