Mmm... I forgot that the XX's first big meeting was the World Championships held here in Blighty way back in 1993 where Joel Johnson took TQ - not sure if the XX was commercially available then - but it was up against the old Ali-tubbed RC10s of Masami Hirosaka[sp?] & Brian Kinwald (who eventually won). So its certainly quite an old design but where as the RC10 (generally considered 'vintage') was coming to the end of its production - the Losi was just beginning - & would be joined by the B2 & B3 on the track.... and since production ran until about 1999 ish, would you consider a ten year old car vintage??
I find it amazing that the XX can still cut the mustard against the newer cars, but then the rules for the class have hardly changed since 1-10th off road racing began so the scope of development I guess is limited - for my money I prefered my old DoubleX over the TripleX I replaced it with