I'm in the process of putting together my order list to take advantage of Brushy's free shipping deal. I'm very curious about what is called the "Ventilated Inner Cover and Moving Screen". Seems like all the catalogs have them. I definitely appreciate the importance of good hive ventilation and I like the idea of leaving one of these on all summer long. But I'm thinking that a couple of 3/4 inch holes drilled into the top super/hive body and screened over will do the same thing. Will save the cost too. Before I order some of these I'd like to find out if anyone has had experience with this equipment and would like to offer some ideas about how well it works and if it's worthwhile. Thanks.