If you use one email address sole for transactions, and one for personal emails, Inbox is actually pretty awesome. I don't know many people who do this though.
I have a work Google apps account and a vanilla Gmail account and it is frusturating not having a unified inbox. And I keep getting "Network errors" with it (on two devices that I tried).
I recently dumped the GMail app for Outlook on iOS and it has just been phenomenal. I wish the search was a little better and I could see my GMail labels, but for now, it looks like I won't be going back.
How does that work if you're using Windows phone?
"Microsoft has been forced to get it, their stuff works great on all platforms"
I can't get IE, VS, or much else from MS to work on linux. Until then, MS isn't really working on all platforms.