It's not bad. Collabora's spreadsheet requires a double click to edit a cell. I can't begin to guess how many times I've clicked in a cell, started typing, only to find the cell still empty because I didn't do the one thing that other spreadsheets don't require - a flippin double click.

If you want a cloud option, Cryptdrive is pretty good. https://cryptpad.fr/drive/ Web based so should be good on any platform, docs can be downloaded and edited locally if you want.

I've been using dDocs which someone recommended here and it works great on my android (not an app, which I like). Just throwing out another idea alongside yours!