This topic is to see who all in guild would be interested in going for gold in all 9 of the Mists of Pandaria Challenge Modes: 

Things of note:

You will need flasks, food, and dps pots in order to reach gold and most places say you need invisibility pots as well.

I'd highly advise reading this forum post: http://us.battle.net/wow/en/forum/topic/6863526914

In the above link you'll see videos for every challenge mode as well as helpful pieces of advice. 

Furthermore, if you do want to do them, be prepared to wipe a lot. I've heard of some people taking 15-20 hours to finally get a challenge mode down on gold, and I've seen minimum times of 2 hours for learning others. 

If anyone is interested, here are the rewards for all the challenge modes:

Bronze: Title of The Undaunted

Silver: Pandaren Pheonix Mount

Gold: Full transmog set for your class with special animations per class