Many users asked Photoshop to support the MS APIs, because their tablets didn't support the WINTAB API correctly.
And Wacom functions are working for most people. Those who have trouble with it usually need to update their Wacom drivers, or enable the Ink setting in the Wacom control panel.
And yes, Photoshop CC 2014 was tested extensively by many people using many different models of Wacom tablet - without any problems.