I purchased the X and so far am pretty happy with it. There are a couple of things that could be improved ( but so far so good.
The biggest reason I purchased the X is that my wife currently uses a 6 and I have a feeling that at some point, hopefully towards the end of 2018, the 6 will have an issue that will require a replacement. I can offer the X to my wife and purchase an X 2.0 version, hopefully with a larger screen.