Don't be a dummy, wear a helmet
I purchased the Large, as I have a rather fat melon, and it fits perfectly. I would highly recommend measuring the circumference of your head for sizing purposes. If you find yourself in the middle of a size range, go with the bigger size if you usually wear a beanie or balaclava (although the Holt is plenty warm and you might not even need any insulation- note the ear pads).
Pros: It fits well with any smith brand goggles, or most brands for that matter (I use this with my scope pros and they have yet to fog up on me). It is warm while being well ventilated. It has a convenient and easy to use goggle clip on the back. It saves brain cells for less money hard to beat price.
Cons: The chin strap can be a little uncomfortable in cold winds, but that can be easily remedied with a layer of fleece. Not the most slimming of cranial accessories (especially the Large in matte white) which could be a problem if looking sleek on the slopes is a big deal for you.
Overall: worth it.