This is a great Optimus Prime, probably the best Movie OP closely followed by TLK's voyager OP.
This is the same mold used by Wei Jiang commander M01.
I always find transformation tricky on the top part, it takes very particular order of things and positions of the arms to get it all fitting together. But the end result is amazing.
My only gripe? The head sculpt. I am not a fan of open mouth Optimys, so I would have loved to see him wearing his face mask. The lack of paint apps in robot mode are also very noticeable.
This is a duplicate I bought for a very cheap price, since I already have it closed in box, and this is my 5th occurrence of this mold: