The first GA-400 models were released in August 2014, but I became seriously interested when Casio released the Hyper Colors models one month later. Although a lot of elements of the GA-110 model are present on this watch, the 5 buttons and a scroll wheel, that looks like a beefed up crown, makes it look much different than the earlier X-Large ana-digi models. Maybe the best part is the scroll wheel and it's protection, breaking the symmetry, as all earlier models are simply round. Also, it does not look too,serious. This scroll wheel feels quite solid and firm. Maybe you can draw a line to the somewhat funny G-001 "Jason". Simply big and round ana-digi models don't need much guts to produce and sell, playful models like these take more guts and that's what I like about Casio in general. They have the guts to experiment with different looking G-Shocks.
Now comes maybe the best part on this watch. One of the most annoying things on a random ana-digi watch is that during the different Modes, the hands block one or both displays. A long time owners have complained about this and Casio now came with an answer. You can move the hands easily out of the way by push and holding the LIGHT button and then push the MODE button. The hands immediately start to move to a position where they do not block the displays. If no button action takes place for an hour, the hands turn back showing time.
There are some extra functions on this watch too. You can choose the backlight duration between 1.5 and 3 seconds and you can turn the Button Tone on and off. Remind the the GA-110 and probably all X-Large ana-digi models had no Button Tones. While some people find the beeps annoying, I like to hear what I am doing. Also the Button Tone sounds in a higher pitch when you return back to Time Keeping Mode. Handy in the dark. Also this watch has Auto-Illumination. Although it is a good and sometimes useful function, I cannot really recommend it, as this watch is battery powered and backlight drains power. Luckily this function turns automatically off after six hours. Further more, if for some reason the hands do not match the displayed time, you can start "Adjust Hand Position" procedure.