I'll chime in here as I went helmet shopping yesterday. I read all the reviews but it really does all come down to fit as everyone says. I've had a variety of brands in the past (Garneau, Trek, Bell, Specialized) but the newer designs with more protection for the back of the head are the only ones I will consider anymore. The skate style helmets are too hot for me (I use a pro tec for snowboarding).
I tried on models from POC, Specialized, Bell, Giro and Fox. I couldn't see any advantages of the POC that justified the price premium and none of the Bells fit me. I love the Specialized fit (I currently have a Tactic) but the look is too bulky for me compared to the others. It was down to the Giros (Hex and Xen) and the Fox Flux.
The strap retention systems used by Fox and Giro are different but both felt pretty solid on the head when adjusted properly. The Fox retention system seems to fit a little lower on the back of the head and feels better to me. The Xen is lighter than the Flux by maybe 50 grams or so.
I chose the Flux - better protection for the rear of the head IMO and a little cheaper than the Xen. I also like the looks of the Flux a little more - even the rear spoiler is growing on me!
First ride with the new lid today and it was great. A little heavier maybe than my Specialized Tactic but the cooling is just as good with fewer vents and much lower profile. Solid build, good strap retention system and hardware. I'm happy with it.