I purchased this because I have had elbow surgery, so I find can openers tricky. It works very simply by locking onto the can as you gently press down. Then no pressure is needed whilst you turn. You then push a button to release the pressure. Good for anyone who struggles with can openers, including my 9 year old who likes to cook, but wouldn't have the grip strength for a conventional can opener. Worth the extra money to me. My Mum has purchased one for a relative with Parkinson's on my recommendation, she is also very pleased with it.