I agree about the second slot for microSD memory cards, with two cards of problems was not, all was stable! As for the lack of support for Google services, in my opinion they are superfluous in the Hi-Fi device, the only drawback is that you can not put the UAPP, but it's not the fault of the lack of Play market, and the developer of the UAPP, which refuses to go the other way to purchase the program outside of Google services. In fact, for listening to music stock application Fiio Music is ideal (if you do not take into account the equalizer, which I have on the M11 worked unstable), in all other aspects - it's a good app! In all other respects, in my opinion, Google services are not needed on a Hi-Fi device, they will consume battery power by background processes. About the sound in conjunction with the amplifier THX AAA + AK4497 in M11Pro we have not yet heard, so it is too early to draw any conclusions. AK4499 will be placed in the M15 and M15Pro, which is logical, since this digital to analog Converter Japanese Corporation Asahi Kasei Microdevices, is the flagship solution, following the logic, must be placed in the flagship device. PayPAL, in my opinion, does not give any trouble, register and pay for any purchases, convenient!