For me as an insider this is teary-eyed stuff. Customers should care because data migrations to Google Apps from Microsoft Exchange will be easier and more cost effective with this tool.
And our team and I will get to spend less nights waking up multiple times to check on desktop data migrations. Getting ahead of myself... Let us put it through the paces on our own internal Exchange Server test beds first. Overall Google has always impressed me with the quality of their product releases. There are third party tools that do the same but most were poorly documented.