I travel a fair amount and lack mental math skills, which drives me to a watch with specific features -- calculator, world time, alarm, backlight and, of less importance but nice to have: phone number data, stopwatch and timer. I'm rough on a watch, so durability would be a big plus, too. The Casio Databank offers everything but durability. This is my fifth or sixth Casio, and they've all done the trick, but the face scratches easily, and its water "resistance" is futile (mere sweat on my wrist has caused condensation that killed a watch). Still, it's inexpensive, light and functional, so until someone invents an industrial-strength Databank, this will do.