No problems here either on R9 290 and Rx 470, at 1080p, 1440p and 4K, multiple monitors.
In fact, I highly recommend this graphic driver for all those who like to change brightness/contrast settings, since the are now within the driver panel, and also take effect immediately (unlike the old drivers, where the settings won't apply unless you open additional-setting dialog box)
I hope the next driver bring the "Gamma" setting in too, which for some inexplicable reason isn't there.
By the way, the person posting about "ASS Cancer" deserves no sympathies from me. That's not a rational response even if your cards flat out stop working altogether. If he is a teenager or under, this type of idiotic anger may be somewhat explainable (though still not justified), but for all other age groups, it's frankly embarrassing and pathetic.