I've have had an AK300 for about a year now and have been watching this thread and considering an upgrade to the Sr15, mostly to get Spotify. Recently the device has begun bootlooping, sitting at the spinning 'A'. I have a number of Android based devices in the past and in the rare event that this happens this can almost always be fixed by a system restore from the recovery menu, or even as easy as removing the battery.
Worst case scenario, unless it's a hardware issue you can use ADB/Fastboot to reinstall the operating system.
Unfortunately, with the AK300 there is no documentation on the recovery menu and no recovery tools.
You'd think when you pay this kind of money they would have some sort of restore tool for PC, readily available roms, or at least some sort recovery mode described in the manual that can be done from outside the OS. This is provided by every android based cell phone and tablet manufacturer, even the old iPod, yet this is not available from AK. Without a service center in my area, I'd be charged nearly $200 for the software reinstall and $50+ for shipping. Seems like a cash grab when this type of information could be made accessible, and nearly always is.
I guess during the first year when you have a device that works well it's easy not to consider the importance of the support behind the product. Recently I found that a device costing as much or more than any phone has less support, no support tools, few support centres, and no interest in providing the tools or diagnostics. Android devices are known to bootloop, at least give your customers a way to restore for an android menu that exists for every device.
It's unfortunate, but it's likely driven me to look for a device with a actual support professionals that are willing to help instead of just ask for money, recovery tools, firmware posted, or one that isn't so locked down . A&K is often known as the apple of audio but at least I could reset my iPod from iTunes.