Tom, I do have one. It works well for what it does, reliably producing a vacuum sealed package. They are not necessarily the lightest or most easily used package for my trail needs these days.
The Food Saver brand is much better quality (only a bit more expensive) than one I'd previously bought at Wal-Mart. My lovely bride gave me this one for Christmas.
I used sealed bags when I first started making my own dehydrated trail meals several years ago. Even then I would pour boiling water in the opened bag and simmer the meal there. That works OK but I found that quart zip top bags are easier to use.
As to the odor sealing, I wouldn't trust that a vacuum package would be enough to protect food from rodents or other critters. YMMV.
These days, I use the vacuum package to seal things for trail use that I want to be completely certain are dry, such as my emergency fire starting kit.