For me - in my personal experience, selling, setup up and using the Kestrel Range... Bluetooth works 90% or the time, most of the time. I have had it not work enough times, that I would rely on it for anything critical. That and the phone screen timeouts, etc, are a bit of a pain.
However, it's actually more to do with your workflow and how you think and would like to use it.
I primarily shoot field steel in NZ - this would be similar to what you guys know at the PRS etc, but time limits aren't quite as short, yet. However, multiple targets, different distances, positions etc.
Initially, I bought into the hype/workflow marketing etc and hade the Kestrel up on Wind Vane with a link to the phone. I spend more time gawking and playing with my phone than I did shooting. You do not want to be watching a live update on the phone while shooting.
Now, prior to touching the rifle. I spend a minute assessing the wind, ranging targets and form a plan that I write onto a piece of paper. This includes elevation for target a min/average/max wind. When I shoot, I don't have time to wait for a suitable condition to pull the trigger in, nor do I want to be focusing on anything other than the target.
The vane system, to me, would be awesome for F-Class style shooting, ELR and so on - where you have time to decide when to brake the shot, not have to work with the amount of time you have.