Everything you'd expect from OEM Nintendo products - great build quality, reliability, and after all these years, performance. No less or more than the US version, it works flawlessly.
However, the Japanese Version doors have it's advantages. I've purchased many video games, consoles, and accessories from the Japanese market; mainly because of the condition. US products are often used harshly and not maintained well. Not the case for the Japanese counterparts.
One may spend a few more dollars, but they are well spent.