I'm going to join the "don't log it crowd" for all the same reasons that have already been presented. I recently discussed this with a DPE as well. It doesn't count for anything unless your wheels leave the ground.

However, lets say you take that airplane back to mx and the Hobbs rolls over .3. Mx fixes the airplane quickly and returns it to service. You take that same airplane on the same day and go fly for 1.0. You then are legal to log 1.3.