I bought this product because we needed a negative pressure machine like a brava asap. My wife is going to have a lipid graft and from all the research we have done a negative pressure machine used every other day for the 20 days leading up to the procedure has a large impact on the viability of the transfer and the amount that can be moved. We were not able to find a brava anywhere and this was the only machine I could find with prime shipping to get it in the time frame we needed. I knew that as long as we were able to get the right amount of negative pressure (around -80 mm Hg) and the cups were an adequate fit it would be alright. We were very happy to find that one of the sets of cups did indeed fit my wife for her needs and when we followed the provided instructions and setup the machine it cycled around – 9 cm Hg which is -90 mm Hg. We have been using it and the results have been good so far in preparation for her procedure. I will add a video showing the cups and what the cycle looks like as the negative pressure increases and then decreases to allow the skin to stretch and increasing the vascularization of the area.