Not perfect, but not bad for the price
When I first tried it, there didn't seem to be any suction. I found the red vacuum release valves in the cups were stuck and needed to be pulled slightly to release. After that, this worked very well for about a dozen uses. Then the hand pump came apart. It was possible to unscrew the handle and I found the plunger had simply unscrewed. Fortunately, it wasn't broken and it was possible to reassemble. Other than that, I would have given 5 stars.
Rating: 4 stars