Longtime musician here, been playing at dive bars for ~20 years. The Roadie 2 absolutely changed my life. It's kind of hard to put into words how game-changing it is for guitarists.
For example, there are plenty of times I want to play / sing a song where my voice JUST can't quite hit the high notes. In the past I would just move on to the next song, b/c the idea of tuning my guitar down a half-step was just so daunting. Being able to pull out the Roadie and have it done in ~30 seconds is just insane. But just in general... I probably pick up my guitar 5-6x a day, and the amount of time this product saves me from tuning is just crazy. And more importantly, the tuning accuracy is spot-on, something I could never quite get with my ear and/or an app on my phone.
I'm beyond obsessed and don't really even have the words for it. Very, very psyched for the Roadie 3. Just bummed I have to wait until October to get it!!