This is a solid app and by far the most customizable ad blocker I have seen—with great support. Every time I send these guys a question I get a swift, detailed, and helpful reply.
Be aware that due to Apple's laudable privacy protections, the API they provide imposes some limitations on how ad blockers can detect and block ads; however, 1Blocker seems to work hard to get as much out of this API as possible.
You would be hard-pressed to find a better ad-blocking & privacy tool.