voice of experience, this will take all the loose material off the top, take all the crown off your driveway, will only move loose material and will wear down the bucket quite quickly unless you add some type of cutting ripping bar/teeth.
I added cutting edges from an old grade, 3/4" thick, cut serrated v points into them and in a years time of grading our 1/2 mile driveway, the points wore down to over an inch wide and lost effectiveness.
Only one edge of your bucket probably has a cutting edge. The other edge will wear down real quick. If your driveway is loose and not well packed you may get away with it for a while.
If it is hard packed, I am thinking it won't do much. It will be hard to drag it or keep the edges on the ground if you don't make some type of frame.
Plus as someone else mentioned, you need the little wings to keep from getting all the ridges on the edges of each pass.