Re: No hassle here.
"As our entire platform is Android (as most of the world is Android), we don't have any app compatibility headaches, and we can lock out really old Android devices that aren't patched to at least a reasonable level"
So its your kit then? Employees are free to buy whatever they want for themselves to use and keep it as long as they feel its worth using, and if its not compatible then you provide an alternative?
So how is this BYOD?