I've been using Centred since it launched on Appsumo and have noticed a real difference in my productivity. The white noise/music, breathing reminders, little nudges when you stray off task, and calendar integration keep me focused. I haven't tried the co-working feature, so I can't really speak to that. Centred keeps me in the flow state, which makes it a keeper for me.

Here's my not-so-short wishlist:
More 5-10 minute breathing exercises
The "breathing exercise" screen should be more visible and immersive.
Have subtasks to break down bigger tasks.
An integration with Focus to-do.
Exclude specific tasks from nudges (like screen recording).
An android app for two reasons: to run Centred on mobile without leaving the screen on (to save battery ) and to add tasks on mobile.
An option to set priorities and sort tasks based on them.
An option to filter tags - next week, someday, and so on.
Getting rid of the "is this app distracting you" notification shouldn't require two clicks.
Turn the Coach Panel on and off without going to settings.
The option to turn off "the work with a buddy" on the main screen.