I've tried using an Android tablet for work. It's nigh impossible, even with a keyboard because it doesn't support multi-tasking well. Sure, it supports OS multi-tasking, but it doesn't support user multi-tasking.
Android is based around the single-task model. You have a foreground app that takes up the entire screen and other apps are backgrounded. You can switch between apps fairly quickly, but you can only have one open at a time. There are some attempts to fix this, such as Samsung's split-screen, but none are officially supported. We've even moved to having Chrome tabs use this model.
I love my Chromebook for work though. It does everything I need to do, including having multiple document windows open for multi-tasking.
Chrome OS is built on a multi-task model. You can have many windows open at once and quickly switch between them without losing state or visibility.
Windows tried to merge the two with Windows 8 and it was a terrible user experience. The last thing I want for my dual 24" monitors is to be able to only use one window at a time. Having a messaging app take up the entire monitor is ridiculous. Hopefully they'll find a middle ground. Until user multi-tasking exists in Android I won't be using it for anything but my phone.