Looking at the rate plans, I might pick up a phone just for the plan. Full unlimited for 60 isnt bad at all. (Im a first responder so I qualify)
If you are paying $60 for full unlimited, I suspect you are overpaying.
We're getting quoted in the $40 range, however we may negotiate the contract farther.
I'm placing an order here in the next week for a unit we'll use for testing.
We'll likely be moving our patrol car Cradlepoint units over onto First Net and if everything goes well, move the officers phones over.
Probably won't see any boost in speeds this early in the game. The big benefit is the preemption and better rate plans.
When Band 14 gets rolled out, it'll be a better deal. The Band 14 devices are going to get to run a bit more RF output than the other bands. Testing done down in College Station TX showed that they were getting faster speeds at farther distances with the additional power.