I've owned my 8s kraton for just over a month. My boys and I ran out trucks this weekend. My oldest sons 3s used to be "fast" to us.....add in 4x bigger and 2 times faster, and I've decided for his bday in a few months he'll either have a 6s kraton or an outcast. The 8s kraton wheelies till I want to to stop and it's stable enough for my 8 year old to run wide open .....I'm going to be in the same boat very soon on which model I want for my 12 year old. These things are definitely impressive and it's easy to have a good time no matter where you're running them ..... Now that hard part is going to be finding my 8yo a truck ....do I go 4s so we can share batteries and it gives me an excuse to buy more, or do I go 6s for both of them so I'm stocked up when I go 12s.... Decisions decisions decisions!
Either way, they're all fun, fast, and fun