And this does what different?
Fluval G: mechanical filtration, yes / Other filters: mechanical filtration, yes
Fluval G: chemical filtration, yes / Other filters: chemical filtration, yes
Fluval G: monitors temperature, yes / Other filters: yes and no / Cheap, stick-on-glass thermometer: yes
Fluval G: good flow rate, arguable / Other filters: arguable
Fluval G: shiny and pretty / Other filters: all in the eye of the beholder
Fluval G: lots of shiny and electronic **** to break, yes / other filters: not so much
Fluval G: costs a lot, yes / Other filters: yes and no, depending on what you buy
So, what's different? To me, nothing except that you're buying a overpriced canister filter that is being intended for its aesthetic value, versus its performance. I've always loved fluval products, but I would never waste the money on this.