As an ex-excel power user, this is a huge step in the right direction. F4/F2 now seem to work. Unfortunately there is no way to turn of editing directly in cells. There are strange bugs like auto column sizing doesn't work correctly. Merging cells is a cancer, it would be nice if the drop down offered centering across selection.

While this is still not Excel for windows, it feels better than Excel on the Mac. I think I will start using it.