been in a chamber many times by choice and its a really awesome experience. i would say to do it for sure. question them as much as you can on dive medicine. its always a great subject to learn more about. Plus you can get down there and see how different your voice is. Some people it doesnt effect at all, but i know for me, when am at 60fsw in the chamber i can totally hear the difference. went down to 135fsw in one and it was pretty funny listening to myself talk.