Sitting all day is bad for your health. People with sedentary jobs have a much higher chance of heart disease than those who move around more. The wobble seat provides a solution similar to the Locus Seat deigned by Focal Upright Furniture (www.focaluprightfurniture.com) without breaking the bank.
This seat should be used with a stand height desk or drafting table. (Note the tabel in the first photo of the seat in use is not quite high enough, sorry.)