I own a MiST and I've tested 1.3 & 3.1 ROMs with WB 1.3/3.1 HD-images, and I can't tell the difference with a real A500/A1200. It outputs 50Hz perfectly; smooth scrolling in games and especially vertical scrolling in pinball games is perfect. Also 24-bit pictures looks the same as it is with a real A1200. It's amazing! I've hooked up a wireless keyboard & mouse and I'm very happy with it.