Not-so-sophisticated 1st generation technology
I can't give this disappointing product a 1-star review because it did manage to wake me up, even with the weak vibrate/beep function.  However, I found that it either woke me up right at the beginning of the window or right at the end, in which case I might as well use my cheaper, more reliable, and more comfortable alarm clock.  The accompanying computer software was even more disappointing- I had lots of problems getting the watch to hook up and be recognized by the software, which did not seem to have a delete function for incorrectly-entered information.  If you have sleeping problems, as I do, the best thing I can recommend is improving your sleep hygiene by scheduling yourself enough time to sleep and having enough self-discpline to get out of bed the first time your alarm goes off, and stepping outside or turning on some music to wake up.  Definitely not worth the money, I was disappointed with this product the minute I saw the box.  I just hope I get my refund soon.
Rating: 2 stars