I have the original square version of the Zippi pen (from 2 months’ back), not this one, and there have been some improvements. Because I have two bunny brothers who fell out of love after neutering, I have to adapt every Omlet product with a dividing wall. The original concept was that the Zippi runs would allow the bunnies to mow the lawn in sequence. I spent a lot of time moving the heavy outdoor run/ eglus around last year to find a fresh patch of grass free from bunny holes, so it’s a great idea. The bracing also looks good on this pen. I think the four by four panel version is actually big enough as a satellite pen. Your choice here is the anti dig skirt or the floor mesh to keep them safe from getting out/ foxes getting in.. The big pen had just the skirt, as it is very heavy and doesn’t lift in the wind, even with a cover. I’m a bit concerned that this is relatively light and needs the Omlet ground pegs to secure it (I’ve not tried them yet). They did dig under the dividing wall with no skirt to pursue their quarrel (even through drought baked clay in 2018). However I’m not too sure if the undermesh version I have will cause sore hocks (having come across an indoor rabbit via Twitter who got this condition on carpet- no more vet bills, please!) The cut out panel is brilliant, having spent an afternoon with a pair of hefty pliers cutting the mesh for two doors (ouch). Proud lawn owners need to loosen up a little. My furry under gardeners are improving the drainage and adding fertiliser, although you do need a few bags of topsoil AND grass seed to use as bunnyfiila after you move a run. The tunnel system has to run from A to B to be of use, but the new bigger pen does mean a larger initial outlay when tunnel accessories like the pop ups provide important play value. The system itself works indoors and out and it has made the boys much happier in their winter quarters.