I personally support it. I know I've heard distaste for it from SneakyTako. But I think double ROB can cover so much ground (and air hue hue) that it's ridiculous. I have a few old matches that should be taken with a grain of salt. The last Pound, Chibo and I ran double ROB, but it was while I was on little sleep and we didn't advance past 2 rounds I know. I do recall in one of the matches, I believe it was vs Atomsk and ChuDat, I did a fully charged gyro from one side of the stage to the other while Atomsk was harrassing Chibo with MK under the stage (which killed).
I am the red X and Atomsk and Chibo, blue
The match was saved but is lost somewhere on one of VGbootcamp's wiis or SD cards.
Point is, they have those options and I believe if used to it's full potential could create a really super awesome team and that's not just my ROB bias talking.
Try it. If anything, it's fun as fuhhhh.
Here are a few matches of my old videos. Like I said, take them with a grain of salt. Weren't any good opponents.
In case you care, I was the one reppin the "psyco" tag.
(Last kill was so lulz.)
(Audio sucks and we failed game 2 I think dbl ROB requires bigger stages haha.)
Hope this helps, if any.