A:AnswerThis computer allows for you to write as you would naturally with the palm rejection technology. As you described, this allows you to write naturally by resting your palm on the screen while writing.
A:AnswerYes. This is the very reason I purchased it. It works on the 2015 model. Not sure about the 2017 version of the X2.
This is the model on the HP store that's meant for the 2015 X2.
http://store.hp.com/us/en/pdp/hp-active-pen-p-t5e12aa-abl--1?source=aw&subacctid=78888&subacctname=Skimlinks&awc=7168_1501282280_3c06be924d20d4e69fe8c718a7ea0b02&jumpid=af_gen_nc_ns&utm_medium=af&utm_source=aw&utm_campaign=textlink
A:AnswerAbsolutely not. The Spectre X2 has an Elan digitizer that is "somewhat" Wacom AES compatible (but will not install the Wacom Feel driver).
The x360 has a Synaptics digitizer. It is not Wacom AES compatible.