Yes I read the reviews for the dock and I know many people are having problems. Frankly the dock is not very interesting to me, the TF701 is just the most affordable tablet with all top specs right now. I've been rocking a HP touchpad with CM since CM9 so I think I deserve a little upgrade
In fact it looks like the Asus UI is pretty much stock android (nothing like touchwiz or sense) and considering the few differences between 4.3 and 4.4 on tablet i might not root or flash roms (once that's possible) on my TF701 for a while.
Where I am more concerned is for the long run, OEMs rarely update their devices past 2 android version updates, so if there is no support for CM for the TF701 then it means the tablet will probably not be getting Lollypop and Marzipian etc