I looked at going that route myself. Seems like a decent choice, and the tablet is generally well reviewed. The biggest drawback (for many) seemed to be the limited memory, at 16 gigs, but it's easily expandable via microSD.
I recently made the switch from my stock head unit to a touch screen unit with Android Auto and Apple Car Play. While I'm an android OS fan myself, it can run both in the event I ever jump ship, or have a copilot with an iOS device. This ended up costing a bit more than just a tablet and mount would have, but it makes my FJ look a little more modern, improved the sound output/quality, and I felt it was a little cleaner than trying to mount extra stuff everywhere. Don't get me wrong, a fancy cockpit with devices everywhere looks neat and all, but I like to be organized, and aftermarket streamlined mounts and the like aren't as easy to find for the FJ's since they're no longer in production.