i had a bern, and i will NEVER buy one again. the brentwood is cool looking, but still mushroomy, if that matters to you. also, the ventilation is ungodly bad. i also bought a winter liner for it (i'm a year-round commuter) and that was just as bad. the winter liner was sized correctly, but it didn't fit all that well in the helmet. also, the tiny vents on the top of the helmet meant that it was pretty freaking cold with or without the liner.
in other words, too little venting in the summer, too much venting in the winter.

also, it was really, really uncomfortable. the padding seems to be in all the wrong places, and it never really felt like it was secure. just annoying.

i got a $20 bell solar to tide me over, and i'm still wearing it. any road or MTB helmet with a ratcheting fit system will be better than the bern. it's the reason why bern helmets are now at a 50% discount or more all over the internet.