I always used them so far, but I would shop around now If I wanted a new.
I saw that Asus makes good ones.
Dell used to sell certain models with Ubuntu installed but I do no not see them any more, any way I do not use Ubuntu any more, It has become heavy like a windows OS and it can be buggy also
The problem comes back again to forced selling of an OS (windows) with a PC
I know these people in Atlanta [emperorlinux.com ]
but the problem is with the US keyboard as I am in the EU.Anyway the whole point with open source is to install it your self
I got my 5 year old Dell Studio XPS running now with wheezy so I have stopped shopping around.