No, I would not purchase a Facebook phone.

I do not want an internet services vendor selling me a phone integrated with their services (If there are other services available to use, this usually ends up having the integration unfairly preferring their services)

I want to be able to obtain my device and device software from an entity with little to no bias and control over the software on-device.

side note: The above reasons also apply for my aversion of the Android operating system.