Finally opened got around to opening Grimlock over the weekend and I think I can select a lot of the comments already mentioned in this thread. It did prompt me to pull out the leader AOE Grimlock. There really is no comparison.

One is like a care bear and the other is out for blood.

It makes me wonder why they thought the AOE leader (and voyager) could represent the character from the movie.

I love the detail in the sculpt. He just looks brutal.

Id recommend him just so you can pose him next to TLK voyager Optimus.