I've used it once or twice and have initial impressions
I have a 54.5 head and went with a M/L, this is the best fitting helmet I have ever owned (I usually fit best in Giro size M). Ventilation is really fantastic (my head actually got cold!). It is not a small helmet but it has that POC look, which I like. I will not that this helmet has comprehensive coverage around the side of the head (see photo) and will not fit all sunglasses (my Tifosis didn't work too well).
I really wanted to like these - 80s throwback, made in the USA, great look - but the arms just kept popping off at very inopportune times - actually like all the time. They also stretched out so never really stayed on my face well - but when they did, they looked great. If you are only going to wear these in your car (i.e., leave them there) then go for it, but otherwise I would pass. Sent mine back.