I do this out of habit just because I'm really paranoid. If it does really matter I'm perfectly ok with waiting an extra 50 or so minutes, but since it takes so long I was wondering whether there is any real benefit to doing this.
Yeah, that is the reason why I run the burns through agbx a 2nd time. They've all turned out OK so far, so I've been debating whether I should even do it. The wait time is excruciating sometimes...
I check the ISO, burn it and then check the disc. It takes about 15-20 minutes but I guess it's worth it. If my ISO passes, then my disc passes. But I continue to check the discs anyway because who knows if/when my burner might start having problems, leaving me with a problematic disc that plays, but leaves me banned.