I've had a Petzl Vertex Vent for years (last 2 helmets). TreeFund had a fundraiser selling Kask helmets a couple years ago. I thought: "I want to keep supporting TreeFund and about 40% of the cool kids are wearing Kask, so I might as well". It's been on the shelf for a couple of years, but I broke it out earlier this summer.
My next helmet will be another Vertex Vent. The Kask isn't bad...just a little less comfortable, but the big thing is when my head is sweaty, the entire top pad is soaked (in addition to the front band, which is a given). With the Vertex, its just the couple straps at the top (and, of course the band. I don't recall specifically, but I had a replacement band that I put it in so they must have included that with the new helmet - cannot imagine where else that would have come from?
When I hired a couple of folks that were part time and I didn't expect to be around long, I bought $20-30 helmets off of Amazon. They have an ANSI stamp. I bent and pulled on them. I'm not sure these aren't perfectly fine for full time use...I don't see where $80 for the name brand helmets comes in. For full time use, I'll go back to what I have known, but these are pretty good for irregular use from what I can tell. Easy to add face shield (comes on the second one linked) and earmuffs if you want: