Fillet Preview in Civil 3D 2012

I always remember having to fillet a corner of something and unless I had a actual radius size to apply it was sometimes guess work. A new feature in 2012 is the preview within the Fillet command. Once you specify your radius size you select your first object and when you go to select your second object a preview of what it will look like appears if you don't like it you can change the parameters before you draw the final arc.