I originally bought a vacuum sealer at Sears and that was a piece of crap. Overall, my success rate on a seal was maybe 60%. I had to start sealing all bag ends twice to get a decent seal. And only after a couple years, I could do only one or two bags at a time before I'd have to let it cool down. I got sick of that and bought the FoodSaver brand. My success rate is now about 98% and I can seal 10-15 bags at a time before letting it cool down. I also found the FoodSaver brand bags to be superior to any others. That's just my experience with the 2 diffferent units.