During SDCC 2011, the Super Saiyan Son Goku "Special Color Edition" figure was released exclusively for this event. This marked the first exclusive figure of the franchise, which is essentially the same as the 2010 version but with a recolor inspired by the anime colors and an improvement in the facial expressions, as the original version’s faces were somewhat "ugly."
We have already mentioned that this figure, Goku SSJ Special Color, has the honor of being the first event-exclusive S.H. Figuarts, specifically from the San Diego Comic-Con 2011, where it could be purchased at the Tamashii Nations and Bandai booth. It is also worth noting that it is the fourth figure in the collection and the second version of Kakarot in the line.
As for the figure, its sculpt and accessories are identical to the original 2010 version. What makes it “exclusive” is its new coloring: while the standard version had poorly executed faces and an "old gold" tone for the outfit, this edition notably improved the facial expressions and adopted a more intense orange, matching the anime. Additionally, like the original, it includes shading throughout the figure, even on the hands.
Nothing more to add, except that today it is overrated, mainly because it is the first exclusive in the line and its limited production.
If you want more information, I leave you a video from our friend on the JP Dioramas Perú channel on YouTube, where he shows this figure in detail.
Here you will see some of the more than 200 S.H. Figuarts releases that Tamashii Nations has brought us from Dragon Ball.