I have been using an upright model food saver similar to this one.
It has been working pretty well. I have used it a lot as in the spring I vacuum seal smoked steel head, then in the summer i vacuum seal a lot of vegetables that come out of the garden and meals for raft trips.. Then in the fall i vacuum seal at least one deer and one elk..
I love using it for river trips. i make a jambalaya a lot on trips and i just prepare everything, measure it, chop it, then vacuum seal it. at camp you just start cutting open bags and dump it in a pot. I love the simplicity of it and the work you put in at home is well worth the ease on the river.
As mentioned above if you can swing it i would go for the weston, or the cabelas which i'm sure is a weston knock off. But they are expensive.