Today I did my first advanced spreadsheet on LibreOffice after switching to Linux, and it handled itself pretty well. I had to search for some features on the web at first, but after I got it down, I felt comfortable using it. Also, LibreOffice’s default menu layout is not pretty, but I can find all of the functions with just a click, unlike MS Office’s ribbon menu where I had to click around to find what I was looking for. Sorry for bad English.
Not sure why you got downvoted, it is a fair question. Real time multiuser editing is a powerful feature. That said it is really only needed a small fraction of the time for specific types of collaboration. Also, it can cause problems as well. Libreoffice Calc meets most of my home spreadsheet needs: calculating mortgage rates and future value of investments and such.