LibreOffice is equal to any office software out there, and has been much more stable than OpenOffice, and works without an internet connection unlike Google Docs.
I recently read an article about how the "Open XML" M$ format was artificially made super cumbersome and complex so that it makes open source software support it almost impossible.
The article was written by one of the Libre office collaborator who was saying that they are intentionally introduced bugs so that we never see a better adoption of it in open source tools.
Everyone should use LibreOffice ... unless you work in a very specific office or school environment that specifically requires it, go install Microsoft Office, and even then, get your school or business to pay for it
Otherwise, for day to day document writing, letter writing or anything you have to do for yourself at home ... LibreOffice is more than enough.
About five or six years ago, I was buying a new laptop at Bestbuy and I found myself a great deal and specifically asked for a system that didn't have an OS with it or any software ... they got an old returned unit, wiped the drive and sold it to me for about $200 at the time. While I waited, I listened as a salesman sold a new laptop to a clueless mother buying a unit for her son in high school ... they got her to buy a $600 laptop, all sots of extras and MS Office and topped her off at about $1000 for a shitty laptop that was no more powerful than what I was getting