It's not bad - I almost ordered the car in green sight-unseen 'cause I thought it'd look really good. It actually looks a bit ordinary.
After seeing this pic I'm glad I made the choice to get yellow (talk about a 180 degree turn). I had a Dodge in a very similar color to Sepang Green. It looked great, but I would prefer not to have another car in nearly the same color.
The dark gray is probably better - but the gray will also show scratches more than this. 'Course, that's just me.
i think the only shade of green i've really like on cars is the civic/odyssey emerald green. I see the pasats with that off green or whatever the hell it is, and it just doesn't fly, at least for me. I think the only thing Sepang green will have is distinction because there are so few on that color, but it just doesn't seem like a proper Mazda6 color...at least in my opinion.