I picked up 2 of the 1/2 Zips in long sleeves this spring and love them! As Chris says, the stretch in the material is perfect and doesn't restrict the range of motion. One of the reasons I haven't gotten a SS version yet!
And.... last fall I got a SofShell Vest which is full zip. Let me say that it is so warm and comfy and really is great for cooler mornings. I love it!
@Kabo.... your question depends on how warm you want to be. And if you feel constrained by sleeves. And how many layers you like to wear.... It's all about your comfort!