Well, if all conditions are met, it should be 'on'. But 'on' merely means "all conditions to have data pass-through without further processing" are met. Now you understand that data that already is passed relative fast over a router because its little data, or the router is powerfull or has not so much to do anyway, than the difference will hardly be noticeable.
Some say it brought the ping times down a lot. But what does that mean if I already measure a ping over my links that are 1-4ms? Are they now 0-3ms? That falls way within the fluctuation margins anyway.
Maybe if you can create a consistent heavy data stream over a link and than do a ping over the same link? Than maybe you should be able to really notice that ping times go down....?
Regarding the 'notification' of some settings to 'really work or not'; I saw a post about testing the rc6.19
http://forum.mikrotik.com/viewtopic.php?f=1&t=87911 where flags are set for some functionality settings to tell you if they are a'allowed' ('working'?) or not. That's a little help....