Join Date: Aug 2007
Location: New Hampshire
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I do not have specific knowldge of the SJ24, but I researched Clark's SJ21 very thoroughly and decided to pass. The overall consensus was that they were very popular, but rather lightly-built compared to competitors of similar size and vintage, like O'Day, Chrysler, Santana, et al. But then they are also faster than most of those.
I would stay with the oft-given advice one sees here... evaluate your anticipated use, where and how will you use it, whether you will trailer, etc.
That should lead you to design criteria (light / heavy, swing-keel or fixed, etc.) you should be looking for.
And of course, for older boats, it is the actual condition of any particular specimen... give me a good-condition lesser design over a marginal-condition great design any day.