Granted, I am the president of Flylow and this is our new show pony of a jacket, however I can honestly say that this is my new jacket for the season (and I can have any jacket I want).
Why? You may ask... Well I now live in Tahoe and with the winters being... well a little under average as of late I find myself heading our for a tour at least half of the time. I also ski at Alpine Meadows, which means I typically boot packing or side stepping for 5-15 min per run to score some powder or a steep line. So, having this super breathable and light weight Flylow jacket is perfect for me.
On full touring days in the mid 20's I can wear this jacket with a base layer on the way up, then close the vents and drop down my line, then open them up and head back up. It is pretty nice to have a jacket that can do that as well as the Genius.
I am 5'11, 175, 38 years old and wear a LG. If I was going to spoil myself I would get a medium for summer activities too. but I am a frugal dude, so the large works all year and has good style for me in bounds.
Oh, and I have test 2 generations of samples of this coat, so I have some experience to comment.
Hope this helps.