I bought one on my VT50. I hope it breaks this year and is irreparable so I can pay pay the difference for the ZT60 or F8500.
I didn't get one on my last Panasonic plasma, which I sold to a friend, and it still works (it's a model from three years ago). I only had two problems with it: 1) The batteries inside the original remote exploded -- leaving dried battery juice all crusted up inside the remote by the time I discovered it. Yes, they were the original Panasonic branded/supplied batteries. 2) The Smart TV functionality just quit working. Really odd. I didn't really care, since I never used it. Pressed the Viera Cast button, and the screen would like it was attempting to launch it, but never did.
Ask yourself if the peace of mind is worth it to you.
ht Panasonic 60" ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Sony KDL-32W650A, Sony BDP-S1000ES, Marantz PM8004, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT, Sennheiser HD598
lr Panasonic 50" ST60, Sony BDP-S5100, Apple TV
pc Energy CB-5, Audioengine D1, FiiO A1