A good thing about the Champion Chamber is that you can have all your champions at one easy to reach place. Apart from that, the Champion Chamber does nothing so can be used to bait other monsters. Also, when the building is destroyed, the frozen champions you have inside won't be hurt. When you put a champion in the chamber, the feeding timer pauses, so its good to freeze all of your champions so it won't restart it's evolution. The Champion Chamber is also an alternative to juice your champion .
A Champion Chamber cannot be recycled with a frozen champion in it .
You can have more than 1 champion at the same time. (The max that can be frozen in the CC are 4 Monsters.)