I'm not world wild champion but i think the X pro is more easy to drive, and it's easy to have the parts and options. There is some very good driver in Uk, US. Ansmann have take some driver in germany, and in france i try to have some friend drive the X pro with me and find some setup.
And if you have any question you have in Oople forum the good answer.
(the most difficult for me it's in English!)
With the new losi the older car will be sell shipper and shipper.