If you keep it reasonable, most don't have a problem. While, yes, theoretically, the allowed attacks for a BSB using this are about 25,000 per round (one per square for 450 feet in all directions, including up)...

At long as you restrict yourself to 12-16 or so, most don't have a problem with it.

Still, unless you can get some precision damage in there (I'd say you could likely get 9d6 sneak by level 20, with work), and other damages (collision, elemental, vicious, etc etc), each of those attacks will be piddly amounts of damage. Also, damage is spread out, and not useful versus single stronger foes.