Absolutely! If you only engrave tile and glass the filter would last a long time, if you engraved only MDF you might not get a couple weeks even with 1000 m3/hr. Two sides to the equation but they separate calculation if you want to not spend a fortune on HEPA filters. the price of the container of the HEPA filter quickly gets irrelevant after you have gone through a few of them.
Completely agree! For us, the main benefit was the air cleaning, especially using plastics, acrylic etc. Completely eliminates the toxins so that is awesome!
We also have no windows in our unit where our machine is so having a filter unit is great!