What do you hate about it? I like the idea, but I find it to be buggy and incomplete. Not all of the Google services work with it yet, mobile versions of their sites don't seem to support it at all, etc. If/when that's solved, I think it'll be an improvement over having multiple browsers open.

For instance, I'm normally logged into my personal account, which uses Mail, Voice, Calendar and more. To use Mail with my work account, my current account in every service is changed, so my Voice Chrome extension no longer shows correct data, as well as other weirdnesses that I've blocked from my memory since I started using incognito windows instead.