I believe it is a little discussed topic by elite athletes themselves (evidence of guilt?) but I just saw an example of this rare conversation, and I think it is a good thing for the sport. Andrew Bumbalough tweeted that we was moving his apartment to the mountains for the night, which I only assume as a tricky way to say he's sleeping in an altitude tent tonight.
There is always disc on these boards about these tents and other scientific methods used for enhancing these athletes talents, but rarely does the conversation include the athletes themselves.
Regardless if Bumbi was even speaking about an altitude tent, or you are for or against them, I think discussion from elite athletes on their innovative training and living techniques would keep us less suspicious of their methods.