I wrote a post last summer describing my experience using the spreadsheet editor in Google Drive’s Android app. My opinion was that editing existing spreadsheets was acceptable, but creating new ones was not very intuitive.
However, the spreadsheet editor is now much more user friendly. Here are some screenshots of Google Drive on my daughter’s Nexus 7.
I find thumb typing in portrait mode very comfortable on the Nexus 7.
I prefer landscape view on an iPad, but on the Nexus 7, you can’t see much of the document.
Google Drive has a very clean, attractive user interface.