I've not really noticed an increase in the noise, though it's reasonable to assume that the noise is louder. I ride with the windows down and MT's, so a slight uptick in noise is negligible to me. The floorboard is warmer over the trans tunnel, though not to the degree of burning, slightly warmer. The only downside I've had to doing this is that the lining is coming up in the drivers side floorboard where my feet rest after 2 years. I used Monstaliner, and was very diligent about my preps. I don't know if it's my preparations, product not meant to handle that much use, wrong application, or just product failure.
That being said, it's so much easier to go to the car wash and spray out the entire interior.