My wife and I decided to make an emergency 30 day food supply and I bought this to seal up foods mostly for that purpose. After a trip to the grocery store to buy our first round of stuff, I was lined up and ready to start sealing everything. When it works, it really does a great job. For dried beans, I poked a hole in the existing bag so the sealer could get the air out of the inner bag as well. The result was a package of dried beans hard as a a brick - good thing.
I did mention 'when it works'. After a couple of bags were done, I started having an issue in which the unit did not suck out the air and went on to seal the bag. I quickly aborted the process to save the bag and retried over and over with no success. After messing with the unit for a while, I finally realized that I had to reseat the gasket/seals (as others mentioned in these reviews). After doing so, it started working property again. That said, I am a bit disappointed as I have to mash down and massage the seals about every fourth or fifth usage.
Next, as someone else mentioned, you do have to press fairly hard on it to activate it. The unit has a 'hands free' indicator on it which simply means it has acquired enough suction that you no longer have to press down on the unit and it will continue on its own. This is fine for many items, but when I poured a box of dry rice into a bag and started to seal it, my arms started to get tired really quick as it seemed to take much longer until the 'hands free' kicked in. Makes sense that it would take longer given that it was loose rice in a bag. Still, when you're doing many items at once, your arms get a bit of a workout.
I bought the combo box of bags (4 - 11', 1 - 8", 30 quart bags), which seemed to be a good starting place.