depends on what sort of extraction table u get, some just suck it away from the top of the desk and blow it out underneath and others have a pipe under and you can stick it out the door or window which is good. The only reason they say they are not the best is because they dont actually dispose of the dust unless you have a way of blowing it outside.
I dont use any because i am a gel girl and 99.9% of my clients are gel too, but when i do have a L&P client i will make sure i dont have any drafts of any kind to blow the dust around, i use lint free wipes, not a brush to wipe away dust and i also offer dust masks as one of my old L&P client had bad hayfever. It's just like a small mask that covers the mouth and nose.