I run several Macs, older and newer models, personal and work stations. Finally became frustrated with Apple dumbing down their iWork apps to make them more iPhone like instead of real computer productivity software like iWork '09 was. Apple also makes sure the latest iWorks suite will only run on their last two OS versions. So I decided to take a chance on a non-Apple alternative, LibreOffice, and braced myself for more frustration and a high learning curve. I was pleasantly surprised. The software is mature, works well, various apps conveniently integrated, and there is a comprehensive help utility that works better than many paid software apps. I mostly use their spreadsheet, which is fairly intuitive. It only took me a few minutes to get up and running, and then a bit of referring to the Help utility to get preferences set and learn formatting details. Overall, very happy with LibreOffice, which I expressed with a donation towards their continued support and development.