I have him and he's big and chunky, but his colour is a bit too "pink" for me.
Also, he is very light and clunky (literally - very clicky when moving the joints) but feels like he will break if you play around with him too much.
Here are the side by sides of him with my Ultimetal.
He came with free batteries too but I haven't put them in as batteries in figures tend to leak quickly in the HK humidity so I'll save them to use when we eventually move back to Oz.
I'm not as enamoured with him as I thought I would be but given the price he is good value if you want an oversized non-transforming Optimus but can't afford Ultimetal and like that "hulkbuster" look.
Both look awesome figures but which is the Ultimetal one (left or right?)