I am coming from a Nexus 6, and thus figured that the XL would be an easy transition. I also carry a work iPhone 6s, and wanted the personal device to have the larger screen as a contrast.
Definitely happy with the XL, but it isn't enough of an improvement from my Nexus 6 to justify the purchase/price of the XL for me. I'd probably not order the first generation Pixel and wait for next year if I had it to do over again. Yes, I know I can return it, but I'm just going to stick with the Pixel XL at this point and put my two Nexus 6 devices on Swappa.