Let's talk about its basic function as a watch first. I have a small wrist so wearing the larger Casio roundish G-shock won't look good on me. This smaller version with the classic matt design fits my wrist perfectly. As its a G-Shock, there is no reason for me to "baby" the watch so knocking/grazing it against hard/rough surfaces isn't a worry. It has a good viewing angle and the light is bright when activated. The side buttons are a bit difficult and hard to press.
The 2 reasons why I got this watch are for its ability to alert me when I'm at a certain distance from the phone and when I'm looking for it after misplacing it at home. Say you are leaving a restaurant and left your phone behind, the watch will alert the wearer when the bluetooth pairing stops. The problem with the feature is that the alert sound is too soft and will not realize it until much later!
I like the feature of using the watch to find the phone. After installing an App on the iPhone, you can activate a feature which will make the phone play a loud ringtone, even if the phone is in silent or vibration mode. The problem with the feature is the watch's unreliable bluetooth and poor pairing with the iPhone. I think Casio hasn't gotten the software part quite right yet.
The next issue I faced is the battery life... it died on me after just 6 months despite me using it solely as a watch... I then sent it back to change the battery (which took one month!!!) and the weak battery indicator still reappeared... according to Casio, the watch should last at least 2-years with the bluetooth being activated.
The alert function for incoming emails/calls or appointment reminders are ok when the watch and iPhone are able to pair. However, as push-data or data syncing on the iPhone takes up a lot of battery, I decided not to use it at all.
In the end, I didn't use the special features on the watch because of the glitches with the bluetooth. I could have gotten the version without the bluetooth for half the price... Casio has released its 2nd generation bluetooth watches but I have my doubts especially when the app has changed much.
Overall, a disappointing purchase. Perhaps the iWatch could do a better job... but I'm somewhat unimpressed with smart watches from other brands mainly because my phone is always by my side so I really don't need such functions on a watch (yet).