Just to get the ball rolling...
PROS
-a new Starscream, dammit! (I'm a Starscream completist)
-headsculpt (and wicked light piping for the eyes)
-multiple weapon mounting options
-weapons can combine
-spinning barrels on the weapons
-clear canopy (could have been lazily painted)
-ankle tilt
-gerwalk mode
CONS
-on the small side
-feels and looks a bit cheap
-somewhat lazy transformation
-so-so paint job (some blue missing on one of the feet)
-floating shoulders