The first time I used this, I questioned the quality as I thought it wasn’t cutting the veg as I thought/hoped it would, but after realising that you need to press the knob several times over for it to cut through the veg, I thought it was really useful & great. So much quicker to use than a knife & safer. 
Very easy to clean too when you remove all parts - it’s also dishwasher friendly which is another bonus! Would recommend!