The Edge is overrated - you are not allowed to carry your camera and the pics they click for you with their cameras are not clear. The Skydeck is good but we found the Sydney Eye Tower to be better than this.
I really enjoyed going up to the 88th floor in Eureka and looking out on Melbourne! I know a lot of cities have these high floor observation decks. But Eureka was cool and gave you a nice viewing of the city from high above. I really enjoyed hanging out here for an hour or so!
It a must to visit Eureka Skydeck 88! The best time to visit is before sunset and stay till nighttime when all the city lights were lighted up. You will experience 2 different view of the landscape at the Skydeck 88.