Spreadsheet Manipulation Gem

Hi,

Just putting a question out there to the Ruby community.

What is the best (stable/feature rich) gem that will allow me to open
or create an .xls (excel) spread sheet, read/modify the contents, then
save it back to disk.

I’ve looked at 'spreadsheet-0.6.3.1 and roo so far.

What are you guys/gals using?

L