I have always used Ultra-Pro toploaders and penny sleeves, but have wondered if there is a real difference between those and BCW toploaders and sleeves. They look the same, sure, but do the BCW ones last as long? I've heard rumors that cheaper supplies will start to yellow after a few years. Have any of y'all, who have used BCW supplies for a while, ever had any problems with them? The only difference I can see, which is really what has me thinking, is the price. BCW supplies seem to be a little cheaper than Ultra-Pro's. I'm sure a little bit of that, like everything else, might be the name but I can't help but think it might also have a little to do with the quality.