Palombo is a great player, no one can deny that. A very good backup for Pirlo. Maybe a bit too defensive in his approach to play "exactly" like Vidal or Marchisio but I expect he would make their position fit his own movements and abilities. He can't play like any of those two so he would have to approach it his own way. Having the exact same kind of player like Vidal, Pirlo or Marchisio might even be a disadvantage regarding dynamic of player types in the team. However, if we get Palombo I would like to get rid of Pazienza. Not that he's awful but that he's kind of average and I would rather give Marrone and others more time on the pitch (get experience). Something that Pazienza currently is keeping them from gaining and with Palombo on top of that they would never get any time on the pitch even if we play in CL and what not.
Conclusion: Thumbs up IF we get rid of Pazienza after this season AND IF Palombo really is up for it. If Palombo isn't motivated then he won't be useful at all. Kind of stating the obvious here but still wanted it to be said.