Heat The 15 seconds is not going with each temperature stage, but nevertheless it heats quickly. When it is quiet, you can hear a bit of the heating coils crack during heating. (I really hope that does nothing from -.-)
Got the flat iron superfast totally smooth my hair. I have previously used the Remington Straightini, but now my hair is simply too long for that works there is no longer so great. But back to the Sleek & Smooth: I've only set to 190 degrees and my hair is super smooth and shine also totally great.
Definitely you should use the straightener with a heat protection spray, because it really can get very hot (be careful with the forehead, I I've already burned fingers ...)