I've seen the videos of the r4i gold working on a japanese dsi with firmware version 1.4U. But the question I have is how well does it work? I know that it's a clone of the original r4i so does it stand up at all against it in the long run and will it mess up my dsi after a while? I'm buying a flash card today and need to know if it will help or hurt me to get a r4i gold.