Working efficiency is normal degree. There is no waiting for preheat so you can work smoothly. I have not used it so much yet so I do not know how durability is depending on the frequency of use. It seems that the replacement expendable items are complete. I think that it is better if choosing with a cutter is better though the price rises a little.
Anyway it is easy and easy to use. I will let you know by sound when cooling finishes, so I think that there are few mistakes. The seal width is 2 mm, but I am a little worried because I use the sealer for the first time. It may be safe to have a seal width of about 5 mm.