I feel that $700 is way too much for those Coleman go karts. They are well put together and runs great. But its a solid $400-500 kids kart. I got mine on clearance for $349...so it was a steal. I regret not buying both of the ones they had there at the time.
The CK100 has a larger framed...
I bought a "Coleman CK100" from Walmart for my 7 y/o. 3HP, Live axle, hydro brakes. Best part...adjustable seat. Its perfect for him. Except (in his words) is too slow....or alteast compared to his older brothers Murray Kilowatt.