I agree, the hands, feet and sword are nice additions that'll not change him too much. Not sure how much height you actually get from the feet addons though. To give him some height I do what I've seen others do and extend the legs on Tantrum and Headstrong.
The wings are VERY nice indeed, the shoulder cannons as well, but the head is a absolute no-go. The LED makes the whole head light up, not just the eyes and it looks very bad.
I will just have to see how much and how soon I'll commit to upgrading him now that Hercules also is burning a hole in my wallet