The seam is unfortunate, plus the subtle chamfer on the lower corner of the eye surround is a strange addition.
Considering there is so much accurate, detailed information on R2 (like the amazing https://astromech.net/) I'm surprised this guy isn't spot on.
Excuse the metric scale, but at 171mm, this R2 will be too short. The R2 props built by Lucasfilm range from about 1.07m to 1.09m- so R2 should be around 180mm at 1/6.
Don't get me wrong, I'm looking forward to having him next to my Tamashii 3PO... but damn... a few little things would have made this awesome without the lingering thought of upgrading if a better option came along...
That being said, I hope Sideshow do the 1/6 3PO and he's proportionate to R2!
Thanks for sharing the Astromech.net site, it will come in most handy when I decide which droid to get for future releases.