Regarding the disadvantages, now ... the setting is not very intuitive, I had read in the comments and this is confirmed, you really keep the manual handy. Too bad we can not turn the light off, after waking up, by briefly pressing a button: you have to press and hold (-) key as long as the unit goes through all the shades of twilight. Finally, the radio does not pick really great, the sound crackles a lot, and the sounds resemble those of a computer (or a low clock radio range, I guess). Other proposed soundtracks for revival, apart from the birds I mentioned, do not pack it. The "sound of the sea" is like the crackling of a radio between two stations, for example. The rooster, he's funny, but you can not listen again before falling asleep ... Fortunately I did not choose this device primarily on the criterion of its audio performance, otherwise I would very disappointed! I think for those who wish an optimal experience, it is better to opt for the model still above that allows to wake up to the sound of his own music, it really expands the range of choice ... But it is also yet more expensive. Hopefully these products that make them sweeter awakenings in winter will still eventually democratize: it's a shame that this is still a luxury at a time when we have access to so many other technologies!