I have a couple of the Foodsaver vacuum units that I've bought off eBay. Both of them are still going strong after a couple of years. I use them for all my venison, salmon, trout, pheasant, etc.
The are also good when you want to marinade something. Pop the meat plus the liquid into the bag, vacuum and stick in the fridge for as long as necessary - the vacuum 'opens' up the meat and helps the marinade soak in.
willie_gunn