I occasionaly use an 18" Super Stix Ultra on my Q2XL for 3D.
I personally like the Super Stix alot.I use 3 of the Navcom sliders in it all of them containing the heaviest brass weight.
I see alot of the Super Stix being used on indoor spot bows,most 3D'ers I know still opt for a short stabilizer for 3D though.