@sestewart, I don't know about Office 2013, but I have had no issues with Office 365. I think the iOS apps are very well done and the fact that it now supports iCloud Drive is amazing.
The only issue is the new Outlook app not accepting Office 365 accounts. I hope they sort that quickly.
Office 2011 for Mac is really, really long in the tooth and I am looking forward to Office 2015 release.