After having paid lots for feliway over many years without seeing much difference we gave this a try based on the advise of a cat behaviourist and are very happy with this product. The cats are noticeably calmer after we spray and if we forget to change the plugin there is a big difference before and after. Would highly recommend BUT there is one major caveat – both products smell quiet strongly. It’s a herby musky smell which I could imagine will bother some people. For us it’s a small price to pay for noticeable improvements in bad cat behaviour that no other product seemed to help with.