I love my remote controlled R2 - like Jesse said, it fits in great with the Hasbro line of 3.75" figures. It physically stands a hair taller than the other R2 units, but it does so for one simple reason - the functioning wheels. If Hasbro were to make the "rolling action" wheels on their astromechs really work with a push, then those figures would stand at the same height too.
I pre-ordered my R4-P17 from the club yesterday and I hope they are going to also be carrying the all black Imperial Astromech (I'm sorry I can't recall it's name, R2-Q6 I think, but I'm not sure).
Down the line, once we get the new R5-D4, I'd love to see Hasbro share the head mold for R5 and then we get a remote controlled version of him.