Hi, my name is Hank and I'm a tuner user too.
I really am a tuner user and it does seem to shorten the load development process, but I don't want to be. I'd prefer not removing steel from the end of my barrels for threading on tuners and I am compelled to check and double-check my tuner setting when taking rifles out of bags worrying that it moved--even a little...
I am not sure Eric, in the original post, or Bryan from AB is saying that tuners don't work. I think they are saying they don't know how they work, and, if they did, then we could possibly make better informed choices or utilize reliable and repeatable models as part of load development/rifle tuning.
One could find it curiously mysterious or, perhaps, a little shady to attribute sophisticated research and usage to a silent third party, John Myers, while claiming that you were sworn to secrecy about said research and usage, all the while selling a product based on these 'secrets.'
My take is this: if I really knew how to use the tuner--it would help me out not just in load development but also during a match when I detect the load has gone out of tune, however, the manufacturer/seller will only talk about the source and alleged benefits, but not reveal the important secrets and methods. That seems more like like sophisticated marketing for a device that is seen on numerous top-level shooter's rifles.
(All great shooters have barrel tuners. I bought a barrel tuner. Therefore, I must be a great...)
That said, this is still America and anybody should be able to say what they want and all of us grown men can spend our money on anything we want--as long as our wives don't find out!
Hank