I liked this product because it had a radio to wake me up rather than just a buzzer. I also liked the fact it told me how hot or cold it was and what to expect before I got out of bed. The radio-controlled clock is a bonus as it means the alarm always goes off at the right time - though for some daft reason it only updates at 9am? You would think that it should do that in the small hours while you are asleep just in case there is a problem. It only updates once a day, so the timing of that is important. Still, I've never found it to be out of synch so far.
I do find it has a little buzz all the time. My partner can't hear it, but then they cant hear my watch ticking either. It really is a quiet buzz though and shouldn't put you off. The addition of battery use is good as it doesn't buzz on them. I find batteries last about three months if using the radio to wake up, but longer if you use the buzzer/sounds.
This is a tall thin clock so be careful to either learn where it is or look when you go to switch it off as it will have the tendency to fall over if you are not careful. The addition of a foot at the rear would assure most people.
I find the radio to have good reception, though when we all go digital it could be a problem.
The addition of an extra sensor is good. You can either put it outside or in another part of the house. It really only works for about 10 meters, but that should be good enough for most.