It’s slow and prone to crashing. The formatting makes the documents not compatible with other clients half the time. I have lost way too many documents due to corruption when saving (both on third party hosts and selfhosting). I’m absolutely done with that junk. Or, I’d like to be, but any alternative has dropped their own efforts in favor of just setting up an OnlyOffice, basically making them one of the very few open source options out there now in terms of web based office clients.