Normally I'd go 'oohhh ... aaaahh' and get all excited about the blown read wing idea but at a track where both top speed and high speed downforce (whichever trait you happen to think the Lotus style DDRS enhances) are very unimportant. Low speed mechanical grip and traction are king here and if the RBR performs the same way it did in Valencia, a similar kind of track, I expect them to be very hard to beat.
Could be an advantage around Suzuka, Korea and India though.