Having given it a try, I'll just say the idea is pretty good... it's light-weight and basically much like a browser (which is the point of it). It is still in the beta stage, so there are many.. erm, for lack of a better word - flaws in it.
SO, being objective and keeping in mind that it is still under development, I'll just say that it is doing what it is designed to do. It is simple, fast, and web-based.
Obviously, it is not at all like a standard "pc" based OS, it is very very simplistic, basically you have an os that is like a browser... with the exception that in addition to browser tabs, you also have application tabs, it sort of looks like opening applications within a browser etc. ... which is pretty cool and useful, if you are using it on a netbook (takes up little screen space, is fast, just has the basic web based necessities
)
I like it, although I am hoping for lots of improvements - to the stability, added features, making it more manageable and adding more ways to customize it.