I have a regular size and love it. Wear it all the time, about 4k miles since I got it. The usual comment is "love your hat", and "is that a helmet?". I'm old enough (64) not to care. I also don't wear jerseys or tight bike shorts, so I already look different from the herd.
It has come off only twice - a combination of rain and fast downhill - I think that is because my helmet surface is very slick when wet. I've been up to 40 mph and it was fine.
At least I don't have an orange one - It looks sort of like a black cowboy hat...
Sam