Daily heavy user, both in small team and medium sized team settings.
This is the best project, task and team collaboration software available. I have tried them all, and this is the only one that ticks all the boxes (Example: ClickUp is great, but they don't offer Direct Messages, LOL WTF!)
That being said, it still needs a little work.
For example, the images in chat are a little wonky. Video previews are non existent, just an icon that say "MP4" for example. GIF's shouldn't send as soon as you click them. This is a workspace app, that can get people into trouble. The mobile apps are a little buggy, again with the gif integration, you can't scroll back to the top once you start scrolling. Notifications are a total mystery and really difficult for users to get right. Harvest integration is really bad on mobile, and just 'ok' on desktop.
Also, forms should be included at $99 starting LTD. The price for the add-on is ridiculous per month for just that one single add-on ($20/mo?!)
There are many other UI quirks that drive me crazy, but again, at the end of the day, it's the only one that multiple teams I manage have adopted. Despite a laundry list of little things I wish were different, there is an even bigger list of things that they do really well.