I got this watch, because of the vibration option. I don't want to wake my wife up at o'dark:30, so I hoped a vibration alarm would work.  This watch does not wake me up.  Also, while the electronic process to arm the alarm is easy, it is not easy to see the incredibly small word "vib" on the small face, even with my glasses.  It does everything else just fine.  It lights up wonderfully in the dark, etc.  I knew going into the purchase that the watch would be on the small side.  It really is almost little boy size.  Anyway, the markdown in stars is due to its inability to wake me up.  I bought the Dakota Hybrid at the same time with all intentions to return whichever one did not work.  The Dakota does wake me up.