Hi Charlie, I'm with Guide-ID and we provide audio guides for museums and historic sites around the world: https://www.guide-id.com/ We also have a mobile solution as an add-on to our simple to use hardware. We have found that when visitors are given a choice between a simple to use device and a mobile solution, they overwhelmingly prefer the simple device as opposed to using their own phones.
What you describe as a 5% take-up rate sounds pretty typical from what we've seen and/or heard from the field for BYOD solutions. However, most folks that I talk to respond similarly to Mark in that they haven't drilled down into the data to get the actual number. I suspect that the typical number is actually even lower that 5%.
On the flip side, we have clients that can achieve 50% or more take-up rates with our hardware. We also have data from our clients around the world that I'd be happy to review with you. Feel free to reach out to me at jeffdanziger@guide-id.com or 203-246-4829 if you'd like to take a look at this in more depth. Thanks and hope to connect with you or any other viewers of this thread who would like to learn more. With best regards, Jeff