peter I'd be interested to hear your opinion of this once you get it. I tend to avoid relying on (auxiliary) devices with rechargeable batteries, because I expect my gear to last many years and don't trust these batteries after a year or two. Before iPhone, I had a SONY MP3 player that started burning during a gig!! The lithium battery continued burning for at least 24-hours thereafter...
My second concern is the reliance on their unbranded configuration app that may not be around in a year or two.
While this chocolate block was going for around $50 AUD, I finally decided to order the iRig Blueboard at $112 AUD. That's quite a bit cheaper than the Airturn equivalent. Still can't find stock anywhere of the Digit III, but a floor pedal will help for standing gigs.