I guess my big reservation so far is the quality of the audio. The built in mic is no good for higher speed activities from what I have heard so far. For this you need an external mic which is an added expense and another potential mounting headache. And to make it more difficult I am reading that the newest crop of these devices no longer offer a dedicated audio input requiring you to need a USB mic. Now this may not sound like a big deal but from reading the comments on on shopping sites it's clearly a PITA to find USB mics that are compatible and supported by the cameras.
The other thing I don't get is the Bluetooth capabilities of these devices seems to be a joke. You can sync to an iPhone or other devices made by the same company but there's no support for comms or field recorders or anything for that matter. I'd think the point of having bluetooth is to be able to connect to other related gear regardless of make but that doesn't seem to be the case.
The wind cancellation feature on the newer units also appears to be a joke.
I want good sound. I want to hear my dyna muffler when I get on it not a bunch of garbled rumble and wind noise. And I don't want to deal with a bunch of adapters and USB compatibility issues to make it work. I do not have the time and patience for that.
It's all very tempting though. I think I'll take a ride to Guitar Center near my house today and have a gander at one of these things in person. Hopefully looking at one in a music shop I may glean some useful info about setting one up for good audio without much headaches.
This guy has the right idea but doesn't give details!
https://youtu.be/y4DoP-sl9_Y