I've 2GB in my Samsung N120, which has an N270 CPU:
As far as I'm aware of, Netbooks are actually limited to 2GB of RAM, where as the 1GB is a Windows licensing restriction as some point out here.
For usability, I've nothing to complain about and it certainly performs a lot better than most consumer laptops preloaded with heaps of not-so-useful resource hogging utilities and applications. I generally only use mine for portable Internet access and watching recordings on the move and it does both very well. It takes a few seconds to come out of hibernation, log on to a Wi-Fi access point and I'm online. Apart from the smaller viewing area, I generally have no issue with Internet browsing. Ad-block takes care of the CPU intensive animated flash banners. For video, it plays pretty much anything smooth up to 720p. Other advantages include light weight (big help at the airport) and long battery life. At home, I use my desktop.