My last sports watch was a Casio, and it has lasted about fifteen years of almost daily use and occasional abuse. When the time came to replace it (still working, just looking really battered) there was only one brand to consider!
I chose this one mainly because it's one of the few radio-controlled Casio modules with a 24hr countdown timer. Many of them are limited to just one hour of countdown.
The stock photo of this watch (as seen here) renders it rather flat and un-special looking. In reality it's an attractive and rather "sculpted" kind of object. The strap is very well integrated with the overall styling. The metal trim, which some would say is out of place on a rough-and-tumble resin watch, looks pretty good to me, and makes it look a little bit smarter than some digital watches (these things are relative though!) The display is exceptionally clear and relatively uncluttered. I am not sold on the horizontal bar that splits the display; it sits a millimetre or so above the LCD and can cast a shadow.
This module's special feature is the "rally timer" which is supposedly for motorsport, but it's useful for timing other things. Basically it's a simulataneous countdown timer and stopwatch, so you can see both the elapsed time and the time remaining together. It alerts you when the allotted time is up, but it continues to count upwards so you can record by how much you fell inside or outside your target time. It has 10 preset time intervals, which you can customise, so it's actually a bit more convenient to use than the standard countdown timer. But this watch has one of those too, and a regular stopwatch, and they can all be used simultaneously.
The watch sets itself overnight from the radio signal while sitting on my bedside table - so perhaps Casio are being slightly pessimistic when they tell you to put it in a window to ensure reception. I can't say how well the solar charging works, except to say that it has not come off "H" yet.
Negatives: just are a few minor niggles. The modes come up in an order that I find slightly inconvenient. It would be nice if they let you customise that. And there is no way to get back to the timekeeping screen in a single press - you have to cycle through all seven modes. The buttons are shrouded which makes them slightly less easy to press, but they're not stiff like a Mudman. (And I suppose the shrouding virtually eliminates the chance of an accidental button activation).
All things considered, a very nice example of this genre of watch.