One basic feature of a spreadsheet is defining a cell format. In numbers on my ipad i define a cell format as a pop-up menu so a limited number of choices can be made. When I try to edit the same sheet on icloud, I get a message that the pop-up type isn't supported and I must convert the field back to text. This is useless as I use the pop-up type in many spreadsheets. I can not use icloud for any editing. While many may not think supporting the same data types on both the OSX/IOS vs icloud isn't a big deal, I think it is as datatypes are just the start of a spreadsheet which everything else is built upon.