This is the first time that I have tried a cupping device. The strength is really strong at the default level of 3 and it goes all the way up to 12. I have noticed some reduced pain in fascia when using this device (primarily on my upper back) and it has a good heating function to promote blood flow.That said there are a few things that could be improved:1. The release function should be recognizable by touch. Currently I have to stick a piece of felt as I can't find the button to release the function when it's stuck to my back.2. When the 20 minute timer runs out the thing stays attached! Now you have to power it back on and then release the suction. This could have been better thought through.3. I wish the suction cup was deeper. Currently the cup is not deep enough so the device leaves a bullseye pattern on your skin rather than an even circular patch.Otherwise, this unit is fine for the price and the battery life is also pretty good. I'm going to see if there is another unit that overcomes some of the outlined shortcomings.