[lajosbacs]

I disagree -- it is perfect.

On a channel with 100k+ subscribers, the segments to be skipped appear almost instantly after the video is posted.

A bonus is that it skips repetitive content, not necessarily just ads.

[treesknees]

By its design it cannot be perfect. You are getting lucky that someone else with SponsorBlock watched the video before you and recorded the timestamp in the database.