I am looking to trade for a G3 for 2 reasons, this runs a little too dry for me and it is sensative to water depth changes so I am constantly adjusting as I do no have a filter room for constant drip to compansate for evaporation. If you can get past that then this thing is a great skimmer it will remove some of the smaller particals that a G3 wont ( cigarette smoke, dust, etc...)
With all of that said I think the G3 would be a better fit for me until I move into a house that I can set up a filtration room.