depends on what u do. if for word processing, there are good options.
if its simple excel, iWork suit is fine.
powerpoint, everything is better in keynote.
and thats what i use.
Numbers is nearly unusable. It doesn't even have the formulas Excel has. There's a good reason why Excel is the only Microsoft thing I deal with. Pages and Keynote, however, have completely replaced Word and PowerPoint for me, and I used to think they'd never be any good. Now, they might be useless if Apple continues messing them up like they did with iWork '13...