Love it, so convenient!
My only problem is that it regularly slows down Youtube dramatically, but this is solved by turning the extension off -- even just a second before turning it back on. No settings are lost.
When it's not doing that, I'm not noticing any issue, it works great and is so helpful to organise my favourite channels by theme and check on the latest releases by topic!

-Edit to reply-
Right after I posted this, I had the same issue, but this time turning PT off didn't solve it... I don't use any other YT extension so at this point it might be an issue with YouTube itself lmao.