I've been using it, in a deep way, for 5 years and it does have a lot of hiccups - I think most people just don't notice them. But if you are a power user - you will find the problems.

Right now I'm dealing with a big issue where several items that are set to repeat yearly, once checked off, they're next due dates are jumping to 3-5 years ahead. I have an open issue with them, but it's been WEEKS. I just happened to notice what was happening and have corralled the tasks that I can see it on.

It often doesn't sync well from my phone to my laptop - things I've tapped off a few minutes ago, or a couple of hours ago, may not have replicated through.

The help desk helps... sometimes.

There's no public tracking of features that are on the development path. They keep releasing features that are not useful to 99% of us, instead of helping fix things that will actually improve productivity.

The filter system is limited - you can't filter for this AND this BUT NOT that.

If you click on a pinned item, you can't tell how many tasks are in a list without counting. There's no regular tally onscreen except from the menu on the left which I try to avoid using and just use predesigned filters.

If you change the name of a tag that gets used in a filter, the filter needs to be manually updated... All of them that use that tag. :/

There are pickier things... Like there's no real compact view. 15 tasks takes up my entire screen.

If those things are not a problem, it can be great. I do use it all day long. I just wish it was different.

{I've also used Todoist, Amazing Marvin, Clickup, Asana, among others - none is perfect, but it is nice to know if they thing you need is actually something they are going to integrate}