I have limited experience on the J 24 but I will say that it handles like a dinghy and does not need much wind to make it move through the water nicely. They can be a little 'tender' perhaps, as evidence by some folks successfully sinking them: The Sinking of 12
The same club in NYC sank another J24 a few years ago.
The common theme to the sinkings seems to be leaving the hatch boards out once the boat gets knocked down, allowing the cabin to fill with water. Also the cockpit seat storage areas need to be latched closed.
Fast boat to sail though. Not a lot of space down below if you were thinking of spending the night.