I don't think there is anything to feel bad about...it is a really great design and very functional.
We have a grand baby on the way so we opted for the 560 so we would 1) have room in case we were stuck inside due to rain and 2) so the grand baby would be able to sleep with us if we went camping as a family.
I remember when my kids were young, my in-laws had a nice 5th wheel so my daughter slept in their tub when we went camping as a family. While I don't have a tub for the baby to sleep in, I do now have bunk beds!
Seems like your larger version will work perfect for kids of all ages. I think the drawback to ours is that it's only good for kids less than 5 feet or about 8 or 9 years old. So, young families really can't look at this as a long term solution but with a design like yours, it will work well into their teens by which point, parents are ready to kick them out into their own tent. LOL.