I have had the product for about a week.  It's a little different than some of the choppers that I've had in the past... there is no on/off 'button' you basically push down the part of the plastic lid at the back.  I'm not fond of having to hold the part of the lid down in order to operate. I like to multi-task and work on a few things at a time. You have to be sure not to put too much of an item inside to chop at a time. I chopped onions and ended up with 'mush' in the bottom and the sections on top hadn't been touched.