Casio has been steadily improving their DataBank Calculator Watches and it really shows!
-I've learned the expensive way that opening the case to replace the battery in DataBanks invariably results in condensation build up in the case (7 out of 7 times), and the ensuing backwards E's, upside down L's, and other assorted random characters that plague the display within three months make the watch unusable. Its cheaper to just buy a new watch when the battery goes tits-up.
-It now takes two fingers, pressing on two buttons on opposite sides of the case to turn the light on. This sure beats a single large button that constantly gets bumped, wasting battery life. The display has been dramatically improved to show day-of-the-week in large font, right above the large, easy to read time display.
-The algabraic function is now clearly displayed upon pushing the corresponding button in calculator mode; very important when you are trying to compute your vehicle's mileage while road-raging through rush-hour traffic on icy streets in the darkness!
-Current time is now ALWAYS displayed (albeit in a much smaller font) whilst in calculator, stopwatch, dual-time, and alarm set modes!
-The buttons on the front pad seem larger and easier to operate, with less effort, yet providing a more definitive tactile and aural acknowledgement; in fact, this watch uses multiple tones, at differing volume levels. This makes the watch more ergonomic and lends a feeling of precision and control.
-Finally, while I don't believe for a SECOND that the battery will actually last ten years as Casio foists, even lasting five years will make this watch an absolute bargain.
No iPAD, iPHONE, or other iGADGET will EVER replace a CASIO nerd watch on my wrist! WELL DONE, CASIO!