It’s great if you are allowing daily runtime for your buns outside that cage. That is important to note when showing that cage. There are many opinions on cage size, but many agree that the base of a cage should allow a bunny to be fully stretched out 4 times over. The DCN doesn’t have room across the width for 2 full stretches.
An exercise pen can be used as a “cage”. (In this case it was being used temporarily while bonding) The pen in the photo provides about 30 square feet of romping room for when bunny isn’t out for his daily exercise (as opposed to 6 sq ft [base] in the DCN). It was shown as a viable example of how to easily provide more permanent space for rabbits.
As I mentioned originally, NIC cages are another more roomy option. A 2 grid by 5 grid base cage can provide that extra space for bunny to fully stretch 4x over.
As for the possibility of jumping over the pen wall, larger bunnies can’t jump as high as smaller ones. The world record is only 39.” But that possibility would be on me and knowing what bunny might be able to get over. I can say, though, that I’ve used exercise pens for my rabbits since the 1980s and have yet to have one hop over.
For the past 10 years or so, my rabbits have been free range in most of the house all day long (14+ hours) so they have plenty of time and space to run free. So, yes, I am aware of their potential for jumping, running, binkying, etc.
Without your clarification that your rabbits are getting lots of out-of-cage time, it would have been negligent for us to not mention how small the DCN cage actually is. Other people visiting RO might otherwise get the mistaken impression that a DCN is an acceptable, roomy cage for rabbits. It may be acceptable for overnight, but should not be characterized as ‘awesome’ for rabbits. Without plenty of additional out-of-cage time, it is not suitable.
It is awesome for rats though and our girl ratties love their DCN.