As far as I'm concerned this is actually a 6 inch scale base that happens to come with a Red Arrow figure. Although I will say that it's a pretty good Red Arrow figure.
When the Young Justice 6 inch figures first came out, I remember being excited at the possibility of getting characters that we didn't get through DCUC. Then I was excited by the idea of diorama bases for six-inch figures. Then the rest of the 6 inch figures came out and I was disappointed by how character specific and undiorama like the bases were. Then they cancelled the line before the figures I really wanted had a chance to be released because they filled the line with Batman. Damn it Mattel. Of course if I see a figure at a discount store for a good price, I'll still consider buying it.
The rooftop base is very similar to the one that came with Robin. The differences instead of a gargoyle you get a smokestack, which has a wanted poster on it... destroying part of it's generic-use it any way you want to value. But in a nice touch the wanted poster has notches that the arrows can be placed in making it look like Red Arrow has been shooting at it as target practice.