After several attempts with low cost devices, all of which ended in frustration, finally opting for a more expensive device. Vakuumierungserfolg is great, but is very important to ensure only yes no wet food to vacuuming. Schwupps is sucked plenty of liquid and the welding work no longer (logically, is indeed liquid between the sheets). I find that a bit difficult always prefreezing first and then vacuuming only. Also have with paper towels before trying the weld seam, but not entirely satisfactory. What is annoying still, at least on my machine, the sealing strip in the lid (this oval) slips out often and then the entire device to stop functioning. So with each operation check that this seal is in place, then there is no problem. To summarize: a great device, it does not want to miss, but you have to learn to deal with it, reacts just a bit more demanding than the cheap devices. In return, the result can see lassen.Super I also think that you do not have to use the expensive original bag or foil, but it very well is equivalent, but priced much cheaper foils with a little browsing on the net. mfg si.pe49
