Well, its relatively cheap, but if you think $299 or $399 is a lot of money, you probably shouldn't buy it.
The obvious things you'll have to live with--the small screen and the small keyboard. If you are physically big, or older and maybe have carpel tunnel, then the keyboard is probably not recommended. If you are smaller and don't have issues like that, then you'll probably adjust. If you're just using it for surfing, you may not be typing that much.
The screen is fine. The biggest issue for me with internet surfing is the vertical resolution, of 600 pixels. Means a LOT of scrolling. Whether this is sufficiently irritating to you I can't say ahead of time. Will kind of depend on what kind of stuff you read on the internet and what your habits are. But the screen is a SMALL window onto the internet to browse from on web pages in 2008. And the lack of two finger scrolling is strongly felt. May be less of an issue if you use a mouse with a scroll wheel rather than the trackpad.