Both boats are older, IOR designs that did well in Europe, racing IOR. Because of the IOR underwater shapes, they can be tricky to sail fast. I believe they are fractional sloops with pretty small
jibs, so mainsail trim is VERY important. Hearsay relates that they are hard to sail to their PHRF ratings. This may be because they need to be sailed like a 420, at 110% from each of the 8 crew, all the ttime. Their beam and relatively small ballast (I believe they have cast iron keels, rather than lead) make crew weight necessary to hold them flat in any breeze.
That said, the sail handling systems and
rigging on X-yachts that I have seen have all been excellent . They''ve been given enough sail area to be able to move if properly attended to. They appear to hold up well and be well put-together. Layout and finish below have also been quite nice, though some of the earlier models (such as these) may be more stripped out below than others. You could do a lot worse, but
line up a big list of good crew if you want to race and do well.