I just got this top today.  It's a really nice and comfy top that seems pretty warm and a great everyday all-purpose top for Winter casual wear or workouts (I bike and run).

However, I am still looking for a replacement for my old Duofold 1/4 zip mock (collar is about 1 1/2 inches high)  base layer that is over 10 years old and worn out from wearing it so much.  Although the new top is comfortable and definitely thicker, it isn't as stretchy and I miss the zip and collar.
I contacted the company a few times and they just don't make this style anymore.

Don't get me wrong, I do like this top a lot, and it is a really good price for the value.  I do wish that this Expedition weight style came in more colors.  I intend to try an Original Heavyweight style in another color.