The G1X Mark II flash is convenient to use and handles many flash-needy situations.
My shooting style dictates that I try to use the existing light whenever I can. There are also times when I am really glad the built-in light is always there for me when I need it.
I prefer the compact and more powerful 270EX II flash attached to the G1X Mark II hot shoe when I know ahead of time I'll be shooting with flash and want bounce light capabilities.
If I am using the EVF viewfinder, then you must use the built-in pop-up flash on the Mark II rather than a hot shoe flash because the hot shoe flash is needed for the viewfinder.
At wide angle setting (f/2 maximum aperture) the flash has a range of 1.6 to 22 feet. At full telephoto setting (f/3.8 maximum aperture) the flash has a range of 4.6 to 11.4 feet.
These distance ranges are typical for compact cameras and do well for most snapshot photography. A common mistake of amateur photographers is to use this type of flash when shooting distant subjects like their child in the school play or receiving their diploma up on stage.
If you want more power or if you want to be able to bounce the flash for more pleasing lighting, you need to consider alternatives for the flash that comes on the G1X Mark II.
BEST. They are the absolute most convenient flash to use, because it is a simple task to activate them for use and they are always with you and take up no extra room in your pocket, or camera bag. You know they always with synchronize properly with the cameras shutter and the automatic exposure is very accurate.
WORST. They are not powerful enough to cover subjects at distance. The are a small light source and therefore create distinct shadows. They are not the best at all for portrait and macro photography.
Keep shooting Your Canon!
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Example of slow shutter-flash sync.