Excel functionality on my iPad have been a annoyance of mine for now going on 4 years, now I have a new annoyance. Office 365. The home edition of Office 365 is required to enable creating and editing documents and will run you $99.99 per year (although you can view for free). I would much rather have a one time application cost instead of a recurring fee that may be wasted at times.
Apple offers a productivity suite of its own for free, this includes Numbers...which definitely isn't my preference.