This codex is legitimately balanced and all the Ravenwing/Deathwing stuff is appropriately costed. Any DW/RW is going to be light on models, esp considering they have to take an ~200 SC to make those units scoring.
I haven't seen anybody complaining about this dex being imbalanced and my first impression is that it is awesome, aside from a certain degree of inflexibility and the most obvious synergy being heavily weighted towards RW/DW, but I digress since that's not even a balance issue.
I also don't see anything about RW that makes them dramatically better than other bikers in any other dex.
The easiest way to deal with them would be in the assault, with TH/SS Terminators, assuming you could catch up with them, Lascannons, Plasma is a pretty obvious answer, Autocannons, Lootas, or just mass Bolter fire. They're actually less efficient in terms of defense-per-point against Bolters than basic Tac Marines. They will go down to mass fire like the respectable gentlemen representing a well weighted codex that they are.
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