I run a business where I need to vacuum seal my products before I can distribute them. I originally purchased the cheap rival brand vacuum sealer and was utterly disappointed. I returned it that night and picked up the FoodSaver sealer. It immediately worked like a wonder.
It has two settings to seal either wet or dry foods. All you have to do is fill the bag, put it in the sealer, lock the bag down and press vacuum and seal! It creates a vacuum level of 23 [a perfect vacuum is 29] It also comes with an external attachment so that you can hook up mason jars and other storage that isn't a vacuum bag.
The good: the vacuum works flawlessly and the seal is good and thick [more than I can say for the rival sealer. The bad: I didn't like how the sealer has sides on it, Limiting your bag size to around 1 foot square. this is more than enough for most applications but sometimes I need larger bags and the only way to get them is buying the vacuum rolls.
One alternative to buying the expensive vacuum bags is to make your own. I wrote an instructable on building your own bags from plastic sheeting:
overall: I like the sealer, it has the capability to expand and use mason jars and ziploc tubs etc but I would like for it to be able to make bigger bags.