It's clearly beta software, this is especially true on sites where deeper functions are only accessible when logged in. Testing of course would slump in those areas compared to other sites (judging by how the comic suggested they did much of their testing). With that said I just love the performance. It's incredibly snappy and even so with many tabs open doing relatively demanding tasks such as watching an HD stream, streaming audio, and viewing a large picture gallery at the same time.
I must say though, once plug in support starts to show up I could be switching. I'd really like to see ad block in some form show up and especially a plug in similar to Firefox's Gmail notifier. All the other areas are there for the most part to fit my needs and demands. I'm very impressed with it at this state.
I used to use gmail notifier, but then I started using Digsby because it can check my hotmail and facebook notifications as well. It's a messaging client, but you can set it up strictly to notify you of your webmail accounts.