I originally bought a set of those Coralife Adjustable Mounting Legs, but ended up not using them. Didn't like how they attached to the tank (screw clamp on side glass - didn't work with my partial sliding cover). If I remember right, the way they attach to the fixture makes it only work with Coralife fixtures. You can't use those legs on other fixtures.
Before I got the tank, I thought the flip up feature would make it easier to access the tank. But the way they flip up, the fixture is still in the way of the tank. It's just easier to use the "normal" legs and just slide it back all the way to the back of the tank. And better yet, just lift it off and you have total access!