Thanks for the response Terry. I have read before about air coming up from the bottom.
Regarding head shape, I have a big one and defintely not narrow. 
I agree about Webikeworld for helmet reviews and wireless intercom reviews.
Also find a lot of helmet reviews on Youtube.
I love my Arai 3/4 helmet, just would like the benefit of added protection of a flipup. These things get pretty pricey. Would be nice to try first on bike.
Bob...I think Revzilla has a fairly generous return policy on helmets...one of the best in the business, IMO. Might be worth checking into further.
I love my Flip Up...it is particularly advantageous when you have on glasses. I can't imagine ever wearing a half helmet again. I do utilize the 3/4 function on the Shark from time to time though...it's a nice feature. There are things I do not like about the Shark, but the functionality pluses outweigh any minor minuses.
Truth be told...we should all be wearing earplugs when riding. I don't always, but do have a molded set I made from a mail order kit. On long days, they do make a difference in fatigue levels.