We might be biased, but I think they are completely safe. They have met or exceeded all guidelines set forth by the NTSB. Jeep is very much marketing the new 4 door as a family vehicle. Even with the top and doors off the structure is safe for children.
OC mentioned getting one when we have kids. Of coarse if this happens the jeep will vanish in the Garage for a bit and come out a Taller and with bigger feet.
I bet they are just like any other rig. If you drive them responsibly and strap the kids in you should be good to go. Here are the ratings for the 07 if you can understand them.
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