Mbx5

Hello, is the 5 something to have or is it too old and you must have the 6;)??
I can maybe buy it as a roller, 600 Sek, about 90 dollars with bodies and tires some small plastic parts missing dont know what yet.
What do you think is it a yes or a no?
And do mikes mbx6 kit fit the five or do I have to buy the motor mount and a battery tray.
Thanks feffe