Most needed functions are paywalled. Some are not (hence the second star). Seems too bloated If you just want to use the free options -- frequently you stumble upon something that only works when you pay money.
Would use a clone of this with just the free options -- it probably would deserve at least 4 stars.

PERFECT. It is an amazing app with useful features. 10/10

Одна папка и посылают нах

Love this. Thank you.
A small wish? After I've viewed a vid, it can be filter out in the Subscriptions feed, that is good. Can also that vid "loose" its blue dot on the channel under Subscription Groups and my custom groups? Because now I view random vids in my subscription feed, and if I have time I dive deeper into my Groups to update my self on the channels to catch up on vids I missed in the feed. But very often I find that I've seen the latest vids on channels, but the channels are still "tagged".

And the Deck function on Firefox are only loading (spinning) when I open the deck. In Chrome it works correctly. Thank you.
Edit: Last version 11.0.4 has corrected this! Thank you!! 5/5 stars :)

My wish-list:
1. Store custom group images locally, not on Imgur
2. Delete Imgur image after sub group deleted
3. I have no clue where you store the group playlist(50 videos). The playlist is "Unlisted" and the owner is not me. You can create 100+ videos playlist on my account and set it to private, why not do the same thing when creating 50 videos playlist?

This add-on is 5/5 useful and easy to use.
But...
Privacy 1/5

Edit to 5 star because dev answered my question.

Would be great if it wasn't for the non-patreon limitations. I'd lose the toast notifications asking you to rate it, too. Also, it'd be nice if you could create a new subscription group from the same dropdown that appears when you click the add channel to group icon

Edit: I was thinking it would probably be useful if subscriptions could belong to multiple categories, sometimes it's very ambiguous whether they should belong to one category or another since some channels don't always upload the same kind of content

Edit 2: So apparently I'm dumb and asked for a feature without bothering to check if it was already available. thanks Dmitry for pointing out you can actually add subscriptions to multiple categories. I changed my rating accordingly

Edit 3: I rated this 4 stars a year ago but came back to change it because I really hated the spam/toast notifications back then and they only got worse since I wrote this review

I actually have a reason to check the subscriptions page. Previously, it was a giant mess. Now, I can organise everything into their own category. This is something YouTube should seriously consider adding.