To be able to use the chopper, you need to cut the vegetables to size to be able to fit them in the chopper. Too big and the chopper jams. I wouldn't say that it chops the vegetables evenly but I wouldn't use it in a situation where that's necessary - more for something like chilli or bolognese where the veg isn't so visible. I don't think it saves time but it makes the task quite mindless if that's your preference and my arms got quite sore after processing a carrot, courgette & a red pepper.