[pyoung]

I don't know anything about their algorithm, but I highly doubt that it 'guesses' the desired temperature. It looks like it simply records the users preferences based on time of day and day of week, and then tries to mimic those preferences. It will be interesting to see if they also provide a web based interface that allows users to have more direct control over the algorithm (for example hard coding certain scheduled times for the thermostat to turn on or off)

[seanos]

Not a random guess but a prediction. They do provide a web interface.

[teaspoon]

"Second guess" is UK/US English expression meaning "to attempt to predict or anticipate", so I think you and the parent have the same understanding.