I've never ran a xx4 but my mates who have ran them had some great races getting good positions and very good times.
many drivers seem to have moved from the xxx-4 back to the xx-4.
i've heard theres no plans as such of a new 1/10 4wd as of yet but if you go to..
https://www.facebook.com/groups/351091748258639/
someone has a slite diffrent opinion.