For the movie Commanders, they have a small strap that goes to the front of their buckle/crotch area. TCW didn't include this buckle as it wasn't a really important thing to animate.
Rex doesn't have the smalls traps on the figure. Not a big deal, but a clone freak like me notices these things lol.
He is and Rex never really dropped out of the Top 10/12 for the Star Wars Hot Toys section.
As
@chrisstruthers said, SW isn't super hot in Hong Kong (like Iron Man and Marvel is), the majority of their SW sales will be in Europe and in the states. The 501st clones have been the highest selling Star Wars HT for weeks, and Rex is now #3 and he isn't even in stock yet. They won't oversaturate the market like Sideshow did.
I'm happy with the 4 we have for now though and can wait for the next batch of troopers. They have the body and they have most of the assets, will see more clones in the future.