Generally works ok...but the Subscriptions home page with filters is really bad on Firefox and has been for ages. Setting it to only "live" for example will cause an infinite load where it's trying to remove the uploads/scheduled stuff but they pop back in every few seconds.
YouTube restricts the page internally and there is no way to improve it on the extension side. You should use feed mode by group and include/exclude any content type there there, watch the part of the tutorial here: https://youtu.be/r4iX53Qg2sE?si=Bb-cMxi1tDpEDR1J&t=230
