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Got my Magmatron yesterday, but I'm only just now getting a chance to open him and fiddle around. Frankly, I'm loving him (despite the fact that he's a mess of partsforming and panels, but that's unavoidable given his gimmick).
I never had the original toy, so I have no idea how he stacks up in comparison, but I'm pretty sure this guy is MUCH bigger than his original - his Giganotosaurus 'Landsaurus' component alone is around the same size as Kingdom BW Megatron! I've currently moved him to my desktop to stalk around in his huge Magmasaurus mode (though I flipped his arms/back legs and wrists/feet around so that the 'knees' bend the way they do on the show), and he looks great.
One little thing, though - anyone else's Giga have trouble opening its mouth? What you see in the picture is about as far as I can open mine for some reason.