I made the mistake of trying this on first, at the WEG in 2010. You probably recognize the Charles Owen AYR8. Of course I loved it and it fit great. Problem: way too much $$$.
So then I went to the local tack shop, where I found this, the Ovation Deluxe Schooler. This is a very popular helmet, and it also looked and felt great. It is also a very good price, only $50.00
One-K (out of my price range). Hmm... I was VERY interested.
I was even more interested when I visited the Riding Warehouse website for the first time (I think I Googled the name of the helmet, or followed a link from somewhere - not sure) and found the helmet for $30 less than Dover's price. AND - yes, they were discounting them further on IHAD! SOLD. Even though I'd never seen one in person, or tried one on, I had to have it. If it didn't fit it would go back, no matter how great it looked, as I'm not up for taking chances with my head.
It came today, and pending a test ride, I have to tell you I am THRILLED. It fits and looks great, snug but not headsplittingly-tight, and no mushroom head - really comes down nicely on the noggin. The harness is comfy and easily adjustable. It seems to be very well-ventilated. Here's an amazing thing: I knew the liner was removable, but it actually comes with an extra liner, which will certainly come in handy for really hot days! It also came in a nice drawstring bag. Again, I haven't actually ridden in the thing yet but I will be sure to report on performance when I do. As for now I could not be more pleased!
P.S. If you want one of these helmets, hurry up and call Riding Warehouse as their current stock is very limited. State Line Tack also has them for a good price as well, though.