I'm about to install 1/2" locking solid stranded bamboo throughout my 1st floor and Ill be floating it over a wood subfloor. I want an underlayment that will make the floor both sound and feel like the real thing...as much as realistically possible, at least. I'm not concerned about noise transmission to the finished basement below, and I'm in a dry climate so I don't think that I'm concerned about having something that also acts as a vapor barrier (?).

I'm leaning towards either a high end foam (Floor Muffler, or similar) or cork. Some parts of the internet say that cork is the best, in terms of "sound dampening"....but I don't know if that means that it doesn't transmit sound to the rooms below or if it means that the floors will sound more "solid" (not hollow or clicky).

But I've also heard people say that the upper end foam underlayments are now better than cork, and cheaper. So, what does everybody think?

Thanks,
Eric

Go with the floor muffler.

I don't like floor muffler, it is cheapo foam that compresses when working on it and it does not expand back.

This is the best IMO. http://www.healthierchoice.com/sound-solution.html