I'm a chef, and we just got one at our facility in the spring. Worked with it all summer till we closed the course down.
Cool things you can do, other then just sealing it.
Marinate-just add your favorite seasonings and spices, with a little oil seal it. The vacuum pressure opens up the pores and and allows for RAPID deep marinating.
Cooking- For more of the camp perspective, you can make some stuff at home, mashed potatoes for instance, seal it. Then once at the camp just boil it up until the contents are hot, and cut it open and squeeze it out, no dishes.

Even Things like raw stuffed chicken breasts in the bags, can be put into boiling water and cooked losing NO moisture and your meat stays nice and white.
Saves freezer space (or cooler)- Even liquids can be put in the vac packer, then put on their sides and frozen flat, allowing perfect rectangles of frozen soup, sauce, whatever. Everything is the same shape and can be easily arranged to save space.
Saves on purchased Ice for coolers- while at home just vac pack some water and freeze it, no need to purchase those expensive blocks of ice when you just make your own. (NOTE: if you pack liquids, make sure to ONLY fill it about half or 2/3rd's. Experiment to be sure what your machine can do, as when it is sucking the air out, it can...explode...)
Down sides of the packer
-B!tch to clean if you explode something gooey in there
-bags can be expensive (depending on where you get em)
-Most machines can only do small bags, or at lower pressures (need one of them $500 machines to get the super pressure

)
-meat stays fresh longer when its packed, but once you open the pack, the shelf life is DRAMATICALLY reduced, so be sure to use up what you opened
-Some things can pop the bags in the packing process (few that come to mind, lobster tails and ice cubes...

)