I spent lots of time just using the U100 as my only computer and I came to the realization that I could leave my large notebook behind and travel light with the U100 and never look back. I was impressed by the performance the little machine offered and the battery life was much better than what my full-size notebook offers.
The only real issue that I had with the machine was the track pad location and other users may not have that. I never learned to touch type correctly and have an odd typing style that may contribute to the issues I saw with the track pad and my hand location.
Overall, the MSI Wind U100 is a great netbook and my personal favorite. Shop around and you can get the little machine at a bargain that makes the U100 very hard to pass up. Once you get used to the small keyboard and compact dimensions of the U100, you will be glad you don't have to heft a much larger notebook around all day. I know I was!