The appliance works excellently with Caso bags or rolls. Caso's own bags are also absolutely top. But you have to be careful with other brands. Even professional bags from wholesalers don't work well. With most of the foreign brands I tried, the weld seam was bad. Some bags were even burnt through. Reason; Caso pouch films are very thick. And the welding time cannot be set. The appliance heats up too quickly and does not cool down. This means that after the second bag, the welding wire is still so hot that it burns through the seam on the third bag. This happens mainly only with foreign brands. That is why the machine is mainly intended for home use. If you want to weld a lot at once, I would strongly advise against using this device.