MP-08 is a perfect scale with MP-10....if you want toy scale: the G1 toys had Grimlock just slightly smaller than Optimus, and you get about the same with MP-08 and MP-10 However, he's too small for cartoon/scale chart scale. And the FT Dibots are based on the scale chart and thus larger. Not just taller (Scoria came with soles to increase Grimlock's height), but also the wrong build. He just looks off with the FT Dibots. Grinder is the best option. But yeah, I still have MP-08 as well. I just like him too much to put him out to pasture -- currently posed with the Diaclone deco's of the MP's.