Their site doesn't translate well into English, which isn't a big deal since most of their customers are in Japan. I happen to speak English, but am targeting a Japanese audience with my site. Other than that, I am very happy with their services.
I'm happy with the hosting they have provided me. They are very reliable and I don't have any real complaints. When I was signing up, they seemed like they only had the 'standard' hosting services. That was fine with me, but some people might need something higher end to meet their needs.