Hi, I bought this tablet replaced my late Nexus 7 (2012) my little girl has dropped (off-screen) Superb tablet, super fast GPS .... I mainly useful to a very fast signal reception. It is android 4.4 but for the problem of the sd card, just install SDFix: KitKat Writable MicroSD0. possible up to the root v.30 via ROOT ZenFone.
If like me you seek a successor to the Nexus 7, you can go.