Great review!
I've seen him in person and I have to say they've done a really good job to distinguish him and Overlord. The engineering is on the simple side, but I do like the leg transformation; it's a very smart use of the volume in the legs to hide the tank turret.
I will probably only get Overlord, but I suspect lots of comic-oriented collectors would want to get this as well to complete their Phase-sixers.