I downloaded the free version on my iPhone 6+. I was able to set up the app and use it with my guitar within just a few minutes. I was able to play the guitar through the phone just fine, but neither of the two stompboxes would change the sound, regardless of the settings.
I did find a couple of issues pretty quickly. First, when you purchase an upgrade, to get ALL of what you paid for, you have to register the software with the vendor. Otherwise you wont get the distortion pedal, which I suspect everyone will want. Second, you have to plug everything in to the bottom of the iPhone. This software only works in portrait mode, so you cant use an iPhone stand with this software unless you can read sideways.
This app is being deleted from my phone. Not a customer friendly company.