It was hard for me to give up my old cookie manager, which let me choose whether to accept or delete cookies (with the option of setting them on a per-domain basis). But this works slick as a whistle--whitelisting is easy. I deleted all my cookies to start with (wanting to start fresh), so I didn't run into any problems when I started using this. It hasn't given me any trouble and doesn't slow down my 10-year-old system.