As a avid Saim-Hann Eldar player I would never field dual bike councils. Too many points and really you make it very difficult for your list to field the appropriate hammers to go with the anvil of a council against things like MANz and Termies.
The bane of witch blades is 2+ armor and without a power weapon of volume fire (DA squads or heavy guardian jetbike fire for the truly Saim-Hann at heart) you simply will not get rid of those 2+ save having bastards before they put a serious dent or six into your councils.
Now, it can be worthwhile to run double foot council in serpents, one containing Eldrad for power weapon punch, but I personally prefer a single large council with banshee/Melee Wraith lord support and a good DA squad with the guide/doom accoutrement provided by a seer or Eldrad.
All in all, at most point levels, the double bike council is so many points that it massively cripples your army against a majority of the power builds/units out there... but it can be fun!
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