This Optimus prime is very faithful to the 07 movie Optimus who appeared on screen in terms of looks and transformation. This toy has three sound features, one is in robot mode, Optimus saying, "I am Optimus prime" two is the classic transformation sound, three is truck sounds when pressing the button on the back of the cab mode.
Articulation is good, as you can see from the pictures, he has two blades one on each arm, they can be flipped up to be stored behind his arms thou they tend to get blocked by parts that make up his truck mode.
Transforming, this isn't for a rookie, it's pretty hard and the instructions aren't that clear because their done in 2D so they tend to be confusing, get stuck, YouTube it for help there's plenty of videos out there to help. I would rank him as a class 5 instead of Hasbro's rating system that rates legend class figures with the simplest transformations at 2, because of the complexity of his transformation
Truck mode, is only slightly larger than the 07 leader class toy but looks impressive.
I do recommend this toy for older children, for younger ones, adult help maybe required when transforming. The voice feature tends to get a little annoying during transformation due to how the head is designed to fit into vehicle mode so I recommend taking the batteries out.
Overall score 9/10 (voice gets on my nerves during transforming)