I had been putting off buying a Food Saver for years because of the high cost and also the counter space it requires. I also knew that if it was something we'd have to put away and pull out every time we wanted to use it, it would stay in the cabinet. I almost bought a Frisper because it's smaller and cheaper, then I saw the Handi-Vac in the Sunday coupon section. First, it's way cheaper at the grocery store or Target.
It's tricky to figure out the best placement for the nozzle at first, but you get the hang of it and the wand sucks air out pretty well. I love that you can seal something for the fridge, open it to pull part out, then reseal the bag like it was new. Usually green onions start to go brown after a week in the veggie drawer. I sealed some up a month ago and they still look like new, and I've even opened the bag twice to pull onions out.
It's not recommended that you seal soupy or liquidy items (I guess something you could do with a Food Saver). Also, if you're sealing meats, you have to be careful that any juices don't get near the sealing spot or it won't seal properly. If it happens, just wipe the inside of the bag dry and start over.
We've had ours for a month and every day I'm thinking of new ways to use the bags. For such a cheap price (in store price), you really can't go wrong.