Speaking from experience with Kennedy products (2x 3 post k24's, 2x 2 post k24's, 2x k25's), I can only say great things about them. The atties are one of the best quality on the market. Never had a problem with leaking except for one time I just overfilled it without paying attention.
It's not just the atty quality that's great, their customer service is pretty much unbeatable. I had a problem with the posts on my Kennedy 25 and they sent me not just new posts, but a new deck as well. For no cost at all. So if anything goes wrong with your atty or mod, they have your back 100%.
The one thing that's different between the 2 post and 3 post 24 is the cap height and doming at the top of it. The 2 post cap is slightly taller than the 3 post cap. However with the release of the screaming demon cap not only is there added top adjustable airflow, it's shorter as well.
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