I have 2 biocubes, and I love them. I have a JBJ 12 gal. original cube, and a Sera 60 biotop cube. I like them because of their size, and are easy to fix if something breaks down. Even if it's the lighting system breaking down on me there an easy fix for it.
Just search e b a y for this
"End Cap & Ballast Retrofit Kit, Single T4 PL/PC 18w-55w" and you'll see why it's easy tp replace the lighting without having to reorder major parts.
45g Long - High Light Planted Tank / 30g - Plant Grow Out Tank / 100g Tank - currently resealing