[waveydavey]

It would depend on the bitrate and size of the file you're playing. If it's encoded to fit the device it should be fine, although you may need something like TCPMP to play it (free). If you're looking at playing 720p DVD rips then you'll probably have issues with the CPU power not to mention aspect ratio and the size of the image in letterbox format as it's a square screen. A standard 16:9 image would be quite small.