I use a netbook and my only qualm is that they're made to conserve power, so that if you are trying to download things, open programs or play games in browser they are a little slow. A lot of the new ones also have Windows 7 Starter instead of Windows Home or whatever, and you can't change customize the background etc like on a normal computer... not a big deal.
If you can find one for $300 or less it's a great deal. I use mine for school stuff because I wont feel bad if it gets stolen, banged around, or whatever- plus they're made for simply surfing the net and doing work.
I also noticed my netbook has very poor sound quality, so I use headphones if I want to go on Youtube. This might just be the model I use, though (Toshiba NB305).