I've found it's great for Discord, and pretty good for Slack (although I've been using Slack in my browser now that it's become critical during WFH).

Unfortunately it's proprietary, but there's another native client called gtkcord3 [0] that seems to be progressing well.

0: https://github.com/diamondburned/gtkcord3

I use it daily. It's OK. It's better than having a full electron app/browser running, but it's fairly incomplete. (For example, in Slack I can't find a way to set my status.) I also have to reauthenticate every Monday morning which means launching Slack in a web browser to grab my credentials. It's a pain.