After doing a bunch of research on vac sealers, I bought one from Impak a couple of years ago. They are a manufacturer of commercial vac sealers and of bags. Their internet division is SorbentSystems.com
Their websitetestimonials were intriguing, and when I saw the cost of the bags, I was convinced.
The one I purchased (model VS-280) is comparable to the Tilia Foodsaver at just under $100, but differs in design in that it uses a snorkle type probe which allows the use of plain bags which are MUCH cheaper. Quart size bags are about 8 cents, and you can cut them in half to seal smaller items.
The maximum width of seal is just under 11 inches, so it will also do 10 x 15 bags which are about a gallon.
They make many other sizes and thicknesses and even make channel type bags that fit the Foodsaver style sealers (probably cheaper than stores, but I don't remember the prices - check them out)
Machine has worked without fail for over 2 years (and you can get parts, if needed)
You can pull higher vacuums, since the pump will run until you press the seal bar. (early disadvantage - if you leave the switch on and extend the snorkle, the pump turns on before you insert the bag and lock the cover. Took me about 4 sessions to remember this - I'm slow
Low bag cost. With venison and all, I use a LOT of bags.
Lots of bag variety. From small to large, thin to thick, even Mylar.
I'm quite happy with it and it saves me lots of money.