Thats a good summary, yes i agree these features are pretty perplexing especially when your trying to learn them, because as you rightly say, they don't really do much apart from create rules and people may take the attitude 'Why the hell do i need that, i can get the same results with normal inheritance' i know i did, BUT when you actually start using them you see the power that they provide especially when there is more than one coder at work with the code.

I'm glad you like it.

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mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)