Worth the extra money. Perfect size.
A lot more convenient than traveling to the moon for the rocks. Craftsmanship from the moon substance is top notch.
The addition of the moon rocks completes the look of the Fire can setup. A must have if you are getting a firecan!!
I have a 03 Jeep TJ Overlander. Space and especially payload in a Jeep TJ is at a premium, unlike the 4-door JKs and JLs. I was planning only to use a tiny UCO foldable grill and small hot tent stove to stay warm, however, after extensively reviewing the IGNIK firecans and 5-lb gas growler, I pulled the trigger and bought them. I also bought the moon rock versus the lava rock because of its extremely light weight. In testing with and without this rock, there was a noticeable difference in heat retention and output. Couldn't go wrong with the moon rock. My only complaint is it is a quite expensive for the quantity. If IGNIK could reduce cost of the moon rock by 1/3, it would be perfect and of greater value for the user.
Once hot they help radiate heat horizontally, and they make the fire appear more natural.