Kubota has changed their ZD ZTR decks from a stamped deck to a fabricated welded deck called the "pro" deck. Does any know if they mow better than the stamped deck? I do like the front pivot wheels of the new welded deck! I am thinking of trading my ZD21 with a stamped deck for the new ZD pro series. I am trying to determine whether it is worth it! Thanks....Jon S.