I prefer QP's intelligent Improvements over the "power" ones of Tactics and Ascension. I've done Mae'Var's improvement and I loved how it made the battle a challenge, without it getting out of hand. How about improvements in ToB? Illasera, Gromnir Il-Khan, Master Wraith, Nyalee, Yaga-Shura, Sendai (and her priestess and illithid), Abazigal, Draconis (Abazi's son), The geas-ed dragon, Watcher's Keep enemies (Chromatic Demon, leaders of Baatezu/Tanar'ri, etc), Vongoethe, Balthazar, Amelyssan, among possible others? I know, Ascension and Tactics already cover these, though not in the way QP would implant it, as I see it.