My mother has a Presto that I use to pack fish, meats and vegetables with.
Over the years I've probably bagged 300lbs of catfish, 100lbs of veggies, and 3-400lbs of meats that we toss in the big freezer at my house and a smaller one at theirs.
Works well every time, you do have to make SURE that you pat down the meats and get all the water off because the vac will suck it up and not seal correctly.
The biggest KEY to getting a good seal is to do multiple seals. If you notice on the gallon bags they are sealed at the bottom about 1/2 inch long. When the vac is done running and it seals itself, that seal is just a millimeter or two long. I follow up with 2-3 more seals after that one should one fail. To date I haven't had a multiple sealed bag fail.
I'm sure it wasn't the priciest out there or something that's meant to be used every day, but it's good enough to keep my freezer topped off and full of meat for the winter. It is nice to run to the basement pantry grabbed some canned goods, then run to the deep freeze in the garage and pick out chicken, steak, burgers, chops or fish and not have to leave the house on a cold rainy/snowy day. I only live a few minutes from the nearest store, so it's not that big of a deal, I could see a vac sealer and big chest freezer being priceless if I was further from the city and 20-30 minutes from a grocery store.