Incredibly aggressive. So many calls that I didn't want blocked were blocked. They were supposed to do that pre-screening thing but the in app call log would only update about every 2 days so that was useless. I couldn't see who called and what they wanted. So the other option that blocks when they fake their numbers is just a blanket ban. If you say most of your spam calls start with "123-4" than ALL calls, even if it's a Google verified business or in your contacts, will be blocked.