That's what I've been using for work for a while now. It's is really good, though I feel like IRC loses a bit of it's charm, running the client in a browser.

Privately I'm using chat.sr.ht, which is also really good, but with less features than IRCCloud, but I can also easily connect to backend bouncer using irssi.

If you're only in one or two channels, Irssi is okay, but when you have a need to be in multiple channels it get a little rough finding good clients.