Useless
I'm sorry to be harsh, but this is useless or of no real use. I gave it 2 stars because it does provide strong suction, but then what?!  The regular cheap manual pump provide strong suction quickly and at least I  get 12 cups. The heat is very mild and useless. Moreover, each and every device needs to be charged between uses. Whether you are a layman or a pro, this is useless. Buy any manual set, I'll be just fine.
Rating: 2 stars