I just bought a CNC router and needed a chipboard washer. After doing a little research and asking friends, they suggested this fragment from Whiteside. There are other more expensive attachments out there, but since I'm just starting out I decided to give this one a try. It suited my needs very well and left a very smooth and even surface. The MDF surface generates a lot of dust so make sure you have a decent dust collection system or enclosure and of course wear a mask when working with MDF. For the price and quality I think this is a good buy.