I've got the 28g HQI Nano Cube.
Good product so far (been set up since early March). Quiet and you can't beat the HQI lighting.
Negatives about the JBJ 28g are:
Skimmer is weak and badly designed, you need to remove it to open the lid which really sucks.
No internal timers for the lights: sucks having to supply timer for the LED and the Halide (only so many spots on the power strip), you could run the LED all the time but I think the tank should be all dark for a period of time each night (JMHO).
The good outweighs the bad so I highly recomend the product and if your upgrading get something with halide lighting