On the downside, the volume and power buttons are tiny, the layout doesn't work so well for Game Boy Advance games, and you can expect a long wait if you order one.
With two FPGA chips inside, the Analogue Pocket can be trained to mimic many kinds of classic gaming hardware as soon as you fire up a cartridge. Since one of the chips is user-hackable, you may also be able to play games from other systems. On the downside, the volume and power buttons are tiny, the layout doesn't work so well for Game Boy Advance games, and you can expect a long wait if you order one.