I mentioned this to ehreek when I saw him at lunchtime, but it's worth flagging that Ultra Magnus's combined form is a little less impressive to me when you see it side by side and see that it's a voyager toy with some armour attached.
It looks like at NYCC last month, Hasbro had a number of invited fan media do an unboxing of Siege toys, to release to their fansites at a later date... and with the release of the toys (maybe earlier than planned), the fansites are now allowed to post up their reviews and photo galleries.
TFW's can be seen here.
Seibertron's can be seen here.
Alternately, they look like their exterior has been scratched up pretty badly in parts. Short of having chunks of plastic ripped out of panels, I'm honestly not sure how they could have achieved the battle damage look any more effectively. That said, some scorching wouldn't have gone astray either.
When are we going to see siege line in Australia. Most particularly for me Sydney