Gameboy Advance: Great
N64: Good – the hardware is more than enough to run the games, the emulators available are the problem.
GameCube and above: Poor – games are unplayable. (Emulator problem as much as a hardware problem)
I’ve had my Tab S 10.5 for about three weeks now. I bought it as a replacement for an iPad 3. It’s been rooted and all of the Samsung junk turned off. I use a PS3 controller via the Sixaxis app.
I’m very happy with the tablet as a tablet. As an emulator machine its really good. My only complaint is the same complaint I have with emulation on any tablet; how do you hold the tablet and the controller at the same time? I tried an Ipega 9023 telescopic controller, the mount was good, but the controller had poor button placement for my hands. That made the controller difficult to use. Next I tried to DIY solution using a Gameklip and a car tablet mount. The Tab S was too heavy for the Gameklip. I end up propping the Tab S up via its case and setting it on a lap desk. This works, but I would much rather to have it mounted on the controller.
Having such a large screen makes emulating Nintendo DS games much more enjoyable than on a Shield Portable or phone. You have plenty of room to see both screens at the same time. The downside of the big screen is that games will look bad unless you apply a filter. Once you apply some HQ filters though, the games look amazing.
My favorite emulation device is still the NVIDIA Shield Portable, if for no other reason than the screen is mounted over the controller. The Shield is pretty dedicated to one task though.The Tab S is a great choice when you need a tablet but you also want to play some games. The screen on the Tab S is amazing and when you use emulators that support filters, your old games never looked better.
Since the Tab S 8.4 has the same hardware as the Tab S 10.5, all of the above should equally apply to it.