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Looks pretty awesome. Can't see any flaws with it.

Worst thing about it is when it jumps at the end of it's rotation loop.

Model itself looks great through; nice grunge sci-fi vibe. Clean modelling and cool textures.

OMG, those are some sexy...:D

You should release them on Renderosity!

Very impressive and professional! I especially like all the subtle gradations you applied to the textures.

This is a suggestion more than criticism, but you might want to try varying the brightness or tone of some of the buildings, as they all look quite similar. In a modern day city, buildings tend to come in a variety of shades.