The Battle Frontier

In Pokémon Emerald, there was a location you could visit after defeating the Elite Four (just a hop skip and away!) known as the Battle Frontier.
In the Battle Frontier were seven different Battle Themed areas with a multitude of trainers to face. After defeating a certain amount of challenges however, you have to face a very powerful Pokémon master called a Battle Frontier Brain. Once defeated, they would give you their "symbol" which was like a badge.

Did you guys like the Battle Frontier? Was there anything you would have changed? Was it a challenge for you?
Did you ever get all the Silver Symbols in the BF? What about the Gold ones? Was it easy/difficult/impossible/etc? Or did you never even bother?
Share your thoughts on the matter!