For me they are very comfortable. I can ride all day. I can ride for 5 minutes. When I sit on a bike with regular bars I feel like I am going to grab my ankles.
They don't seem that much more expensive. AMC has them in some of their complete packages for the same price Hill Country sells theirs for with Chubbys.
I did not see that they had the Boulebars listed maybe I am looking in wrong palce.