I'm glad to see that they are making all there tanks now with cooling fans. I got one of the first 12G tanks with no fans and it does get a bit hot in the warmer months. I also like the new directional flow nozzel.
I really comes down to what look you are trying to achieve. A rimless 6g looks completly different then and all in JBJ nano. Also the JBJ comes as an all in one, with the rimless your choices are ala carte.
Demand is so great for these that as of Monday JBJ was talking about imposing a minimum selling price for all of their nano cubes. I guess too many people complained that we are selling them at too low a cost.
Frankly, I'd say if you can't compete, then don't try to.
Of course, I ordered my 24g from aquariumplants.com so I enjoyed the good prices. But frankly, the $250 price for a 24g aquarium is already pretty high when you compare it to what you could get for that money in a non-nanocube. Of course, I've heard of people paying like $350 for them which is totally crazy.
The aquariumplants.com prices were just plain reasonable in my opinion (and hence why I bought them at the sale price without much debate).
Now the 6g seems WAY too pricey, since it costs much as I've seen 12g ones in the LFS for.