[cpeterso]

I have used Smartsheet, but the GUI is very "fiddly", due to its heavyweight Microsoft Project world view and lots of controls that it very easy to screw up milestone dates and dependencies. I reverted to Google Spreadsheets after a week. I read an article somewhere about some Google project managers liking Smartsheet so much that they petitioned to use it to track their projects instead of Google Spreadsheets. :)