I have yet to buy a drill doctor.. when a bit get dull I turn it upside down so I know not to use it again.

They really need to have a $50 version. I'd buy one in a heartbeat. But $100+? I don't drill that often to need justify that kind of expense.

What do you know.. they do!

http://www.lowes.com/pd_129482-13261-DD350X_0__?productId=1010329