easy to install and has a great fit on the xr 400. the tank has a good feel when you ride and is not over encumbering, and the best part is you can ride forever without filling up. only two things i didnt like, first was having to use a couple of the original parts, which was ok, but i had a hard time getting off some of them (this is more of my problem and not Acerbis). and second was the fuel line that came with the tank, it was cheap and i replaced it the next day. niether of the problems were major and only cost a couple bucks to replace. over all one of the best things i have ever bought for my bike and i am very happy with acerbis parts.