I agree with the last few replies. These tablets all need custom roms to work after u take it out the box. The good thing is these ROMS are available on this site. You feel comfy with your purchase cuz we all here to answer questions. I think the Rockchip models have more speed. Other than that they all run android OS with a webcam or without and battery life can't really be reviewed cuz of use. I have gotten 5-6 hours (M003) on a single full charge with wifi on and off and watching some tv shows and surfing the web.