I've owned one of these since I was in high school.. and that was back in the days when they still had black boards <grin>
Pro's
the watch is very easy to program and very intuative.
count down timer
repeatable event alarms
DST on off setting
multiple time zones
light can be set to flash when alarms sound
long battery life
non volital memory {you can change the battery and not lose data
low / small profile I've had data watches that sick out on your wrist so bad it's like wearing a ball and chain .. literally!
this watch is small fully functional and comfortable to wear
CON's
the book is about the size of your pinky.... but because the watch is so intuitive you really don't need it except for the special features
and I'm told you can download or print a full sized manual off Casio site
no PC or computer interface... this watch would be the bees knees if it had a PC connection similar to the Casio PC Unite.
no secured area for phone numbers.. lose your watch and anybody that finds it has all your phone numbers.. but hey maybe they'll call a friend and return your watch!!

with all that said
after 15 years of wearing one of these I had to change the battery twice
once right after I got it and again about seven years ago.
I wear my watch all the time and after all these years it still works fine but from use the letters had started to wear off...
so I figured my old watch had more that paid for itself and it was time to upgrade.. I figured after 15 years there MUST be a better watch out there..... well guess what.. there aint!!