[veidr]

They are not completely fixed.

They did fix some of the issues (and continue to), but I just don't think the hardware has the capacity to make it right. There are all kinds of graphical lagging, jerking, and stuttering in my completely-maxed-out-with-all-upgrades latest model Retina MacBook Pro, when using it with 30" external monitors.

Like using Exposé with a couple dozen apps open is like:

    - Hit button
    - Wait... thinking... thinking...
    - Still thinking... wait for it...
    - OK, here is the Exposé mini-window view, sans animation

EDIT: AND, I should add, my monitors are the old stone-age 2560x1600 type of 30-inch, not the awesome modern high-res type ( http://www.amazon.com/gp/product/B00DJ4BIKA/ref=as_li_qf_sp_... ). I don't believe the current MBP can even drive an external 4K display, which is what I think the OP was referring to.

EDIT2: woah, I realized at that price, I really should be using an affiliate link where I get a kickback if anybody buys it. ;-)