Now the issues, and there are a LOT! First, the durability. The thumbsticks are the first premium part, and the triggers are the second. port on the bottom of the controller, similar to all the mini keyboards for the 360 and xbox one) Honestly, I would rather use the Dualshock 4 controller over the Xbox One controller.(Im gonna go off on about the Xbox One controller) Scott the Woz said 'the Xbox One controller feels more premium in some ways but cheaper in others', and I've never agreed with something more than this. if you take away the limited amount of touchpad space, it's pretty much a 2-in-1 controller (minus keyboard, but I bet there are quite a few keyboard attachments that you can place in the EXT. But another plus is the touchpad, which can replicate the mouse extremely well.
The secondary issue with the DS4 is the button placement, like Shady Guy Jose mentioned. Exactly, from what I heard, the gyro and motion is rather great.
