They really do work! TikTok has made me purchase way too many things over the last year or so. This is at the top of the list. It doesn't work as seamlessly as the video I had seen, but they do work! For someone who does a lot of canning, jarring, and pickling, this is just another way to preserve some things, a little longer. I've been using mostly for fruits, veggies and herbs so far.Works good could have stronger pump still works good can’t beat it. Long as you make sure the glass and seal for the top is clean it should stayed sealed upEasy to use. My first time using one and I figured it out with ease. Good suction for the lids.Using it to seal dry goods in mason jars for long term storage. We have had it for 3 months now, and probably sealed 200 jars. If you think it has quit working, cut a small piece off both horse and re attach. The hoses will stretch out a bit over time. We have only had to cut it once.I bought this to seal mason jars after Juicing. This works great with little effort. It seals properly and my juice last up to 4 days in the refrigerator.Did a great job removing air from dry goods that I transfered to glass canning jar. Hoping it will extend the shelf life and wow do they look pretty! Worked like a charm.Fantastic products!! Very easy to use ,Great service .I recommend these to anyone who wants to seal their dry mixes in jars.Don’t need a food saver to use. I like the manual hand pump.