#2 I love the cube design!! I have a cube tank and have had issues finding the best way to use the space and gain water capacity!! It's sleek and looks way better than my 2 twenty gallons!
#3 http://somaticaquaristik.com/gallery/ I don't have dosing abilitys because my homade simple sump just flat out doesn't have room! I love this has the capicity to do so in a cubed situation! This thing looks great. This needs to be upgraded.
2. What appeals to me the most about this sump is the possibilities for customization. This hobby is very diy and I think the ability to customize the sump follows that same diy mentality.