Rounded over....GREAT for the BD. It makes all the difference in the world. Right now I am running a nice smooth round over on the batter side of my Pearl made (6 or 9ply don't remember) 20 inch Dixie BD. The front actually is a bit sharper...I guess the batter side makes all the difference. BTW - running an Aquarian SK 1 on the batter side and just a smooth white Remo Ambassador - with white weatherstripping on the inside (and hole). Best for these though is something like an Evans EQ3 reso with a hole. I have one of those on another MIJ BD and it sounds amazing (that one also has the Aq SK 1 as well). BTW - that one is 20 incher, but 15 inches deep and is a 3 ply with re-rings. Best BD I own right now and possibly the best one I have ever had.
John