OnlyOffice is in my opinion the most pleasant office pack available. I have nothing to complain about, only a suggestion:
Linux may soon (after October when Windows 10 has end of support day) get several new possible users and one thing they will all miss and that maybe can be a deal breaker (of the negative ones) is that Linux has no decent e-Mail client.
I do not know if OnlyOffice has personnel available that can make a good client for emails but competition is not at all hard as having tried most of the recommended then I know that any email client will be better. Outlook from Microsoft is what the newcomers from Windows will be used to could be easily made better (.pst file corrupts when getting big and the too Microsoft made does not correct that is file is bigger then 2Gb which it easily gets).
Please make a client for emails in same nice looking design as the rest of this office is made in and it will be one of the things that can keep new Linux users to stay and not go to new Apple or Windows machines. Not all can afford that. And all the still functioning computers can stay as useful tools instead of becoming landfill damaging the environment.