looking at the one the OP posted the cross bars not having any diagonal support to help spread the load was my first concern.I had a Landpride 2584 with scarifiers, I never once needed to use them. I sold it because I bent the crossbar that holds the cutting edge and it was $1,700 for a replacement blade carrier at the time.
I dont have a LP but but I do have a box blade with scarifiers. I finish grade my driveway with it. Typicaly the scarifiers are just at the blade level so I just adjust the top link for ripping up vs finish grading. I have even just graded it with a landscape rake but that's more of just a touch up.
Your not really going to get rid of any pot holes unless you use scarifiers.