I was experiencing rainout with the S9 and was unpleasantly surprised that the new machine did not come with a heated tube and the S9 would not fit. I did talk with the tech and he said that the heated tube had not been specified by my sleep doctor, but that they would send me one right away.
The moral is to be sure that your primary sleep doctor has a heated tube specified in your prescription.
My mask does fit the standard tube that came with the S10 Airsense. I had the humidity cranked all the way up last night and did not experience rainout, but still have a heated tube on the way.