I have been using Ziploc storage and freezer bags for many years and have always been a satisfied customer. My only suggestion would be that I wish they had a super thick freezer bag for freezing shrimp. The shrimp tails of fresh shrimp are relatively sharp and will penetrate freezer bags, therefore making freezing of them difficult. But other than that one suggestion, I have and will continue to use Ziploc brand bags.
I received the sample in the mail and used it to freeze some meat. I was happy with the results of easy use and how it did well in the freezer. I would definitely buy more to use.