>Any angles less that 120 will draw bracer comb. This true in ya'lls experience???
In my experience it is not true. They don't attach it much either way. Either way they attach it some.http://www.bushfarms.com/beestopbarhives.htm#attachments
There are a couple of advantages to the sloped sides. One is that the combs come out of the box more easily. Another is that the combs have more attachment for their weight and are slightly less fragile. Neither of these are major issues, but they are enough to be noticeable.