FORM:
AS so many other competent reviewers have stated, this is one tough and classy tactical watch.  In fact, the G-shock watches are the preferred watches among Marine Corps Infantry, MARSOC, SEAL and SF guys (NOT the brand that claims to be the "official" issue for those underwater elite fellas).  THAT brand seems cool, until the glowy pieces come detached and wander around in the housing. Not good.

This one won't have that problem and it will still provide you with a low-profile, abusable time-piece with the functions you need to accomplish your assigned mission.

I bought this for timing things that needed to be timed with a stop watch and countdown timer :D, and that wouldn't stand out like a sore thumb as "tacticool" or like a wannabe aviator.

It's not only low-profile in its color scheme, but in its physical stature as well.  Not every tough guy has wrists like Goliath, but they still need a big man's watch.  This meets the need. It doesn't look like you've got a kitchen timer strapped to your paw, but it still looks rugged.

It's classy enough to wear out in town with a button-down and slacks, and may even snag you a few compliments from folks who notice watches. The black ion coating on the buckle, buttons and screws only add to the sleek look.

FUNCTION:
The watch performs as described. It's water resistant to 20 bars (200m) which is good enough for any military operation including diving not requiring helium gas.

It's shock and dust proof with a sturdier band than it's civilian counterpart.

The watch features 12 or 24-hour selectable time formats, day/month/date, daily and date-specific alarms (month & day) so you won't forget that important meeting (or you anniversary!), and an optional hourly beep. Other options include a full stopwatch with multi-lap function and countdown timer with 1-second intervals and optional auto-restart.

One very helpful feature is that the current time is displayed in both the timer and stopwatch functions so there's no need to switch back and forth.

The one function missing is that you cannot silence the button-beep.  For a tactical/"stealth" watch this is a critical oversight on Casio's part.  You can manually short-circuit it with the back off, but you will lose all audible alarm functions in doing so. Not good.

Some reviewers have mentioned that the watch is difficult to read. This is subjective.  I have had no significant difficulties reading the time. If it's in a low-light situation, simply pressing the back-light button offers an instant remedy.  It's unfortunate that the display is advertised as "backlit". It is not.  It is simply an inverted or negative LCD display on an orange-ish plate. So instead of black numbers on a grey plate, you have the whole screen liquid black, EXCEPT for the digits, which show on a rust-colored plate vice the typical grey.  And the light button is blue, not red. This is the typical color for a watch light, but it's not made explicit in the product description.  A red light would have been cooler and more "tactical", but it's functional in its current iteration.

PERSONAL CONCLUSION:
I own numerous military "Squad leader" or "traditional" watches (Wenger, etc) with the analog faces and classic features.  I also own numerous quality brand sports and bracelet watches (Seiko, Citizen, Bulova).  Since buying this watch, I've worn none of them.  It is as functional, comfortable, low-profile, tactical and classy I could want a timepiece to be.  I've even worn this for nights out in town, well-dressed.  It's full of retro-geek meets tough-guy chic.  I might not wear it to the opera...but then again, I just might...