hi baltic,
i've changes since last year from nacra's (f18's and infusion) to the ossie rocketship and found out that the capricorn is much stiffer than most cat's. it realy becomes clear in lesser wind (it just accenllerates with every breath). most f18 are not build as good as the capricorn. upwind there should be no faster f18 and down wind i also found out that it is realy improtant not to oversheet your spi. when you keep that in mind nosediving is not an issue. yes, when you put bundy or heemskerk on an prindle 16 they will probable kick your... but when you compare the results of amature sailors it is quite clear that the capricorn is realy a fast cat.
i myself have (unfortunately) decided to offer my 2007 capricorn for sale due to the fact that my two young boys do not offer me the time to go sailing for whole days. therefore i've decided to switch to kitesurfing. but i've your interested in a lightly used capricorn, let me now.