Go-OO is an OpenOffice.org fork that features faster load and response times, and several features not included in the standard version of the program. Go-OO's user interface is more familiar, with lots of small pieces of polish. Go-OO has built in OpenXML import filters and it will import your Microsoft Works files. It has better Microsoft binary file support (with eg. fields support), and it will import WordPerfect graphics beautifully. If you are reliant on Excel VBA macros, then Go-OO offers the best macro fidelity too. If you expect your spreadsheets to calculate compatibly, or you get embedded Visio diagrams in your documents, you'll want Go-OO.