I should have purchased this long ago. This unit has been perfect for my silversmithing studio needs. It is really effective at sucking up fumes, and the filtration works exceedingly well. The wheels make the unit convenient for moving around as needed, and the vent stays where it is placed, meaning that I can place it in a position that doesn't impede my soldering. While the filters are specialty items, they will last a long time. The only reservation I have about this unit is where the button is located. It would be far more convenient at the top.
I definitely recommend this for any small studio metalsmith.