Are any retail vacuum-sealing systems worth the expense? Living alone means that my leftovers tend to go a pretty long way, and I don't end up using raw ingredients as quickly as the supermarkets expect me to.

For a while I've been considering investing in a vacuum-sealing system to avoid having to throw out so much food, for the sake of both finances and convenience.  Unfortunately, I don't know anyone who owns one, so it's hard to get good advice.  Most of the advice I got was "read some reviews."

Well, I read the reviews, and did the best I could to exclude the obvious PR blitzes from my sample, and it turned out that the reviews weren't very good.  For any of the products that I see sold in stores.

I'm not really looking for advice on how to choose a vacuum-sealer.  I already have a pretty good idea what criteria I should be looking for.  The problem is that I can't find any products that meet it, and I suspect that like so many food-related products, the really good ones may not be advertised or even very easy to find.

So to clarify what I mean by "worth the expense" - I'm looking for something that:


Actually makes a proper seal at least 4 out of 5 times (it's amazing how many products on the market seem to fail this one).
Will last at least 2 years; the break-even point for costs seems to be about 1 year, and many if not most products have been reported as breaking down after 3-6 months.
Will not instantly die if there's even a drop of liquid in the bag.
Does not take up significantly more space than, say, one of the wide George Foreman grills (a little bit bigger is OK).
Does not waste a significant amount of sealing material if it fails to form a seal.
Preferably, can also be used with some kind of reusable container or canister.  This is one of the things I liked about the new Food Saver products in spite of their many reported shortcomings.
Costs under $500 (US).  That's not a hard upper limit if it's going to last 5 or 10 years, but if I have to spend $1000 on something that'll only last 2-3 years, then the economics of it break down.


I suspect that there are at least a few, and possibly many, "professional" models used by the food industry that at least meet criteria 1-6.  Some of these companies may even sell retail-ish models to the general public but probably don't actively market them as such (how many home cooks/bakers have heard of Hobart?).  That would especially be the kind of thing I'm looking for.

But, failing that, if anybody's had an exceptionally good experience with a more mainstream product (i.e. has owned one for at least a few years and/or worked with it in a professional capacity), I'd like to hear about that too.

And, if somebody out there has tried hundreds of these things, had nothing but awful experiences and wants to give a definitive "no" as an answer to this question - please do (and please elaborate).
This is the cheapest chamber vacuum sealer that I've come across: VacMaster VP112. At $669, it's half the price of most other chamber sealers. Chamber models are far more "professional" than the stuff marketed to the home, and my understanding is that they are far more reliable. 

The difference between a chamber model and a home model is that you place your food in a bag in a chamber. The entire chamber is used to create a vacuum, meaning that liquid won't leave the bag. A home sealer will also not go below atmospheric pressure while a chamber unit can get a much higher vacuum allowing for vacuum marination, compression or fruits, and better flavor penetration during sous vide, which may or may not hold any interest for you. 

In terms of your specific questions:


My understanding is that these consistently make a good seal. 
I can't speak to longevity, but these are the kind of units that restaurants use for sous vide prep, so I assume they take a beating in those environments. 
Because it's in a vacuum chamber, liquid is no problem, and you can actually vacuum seal just liquid. 
Major Fail. These things are big and heavy. The one I mentioned is 24" x 16" x 9" and weighs 53 lbs. 
Shouldn't fail to seal. Not sure about waste if it does. 
Cannot be used with a container, but why would you need to rather than using a bag?
Minor Fail. The model I listed is a little over your price range. Most other models of this type will be between $1,250 and $7,000.


The other consideration is chamber size. You obviously can't vacuum pack anything that's larger than the vacuum chamber. The one is listed has a chamber size of 12" x 11" x 5".