Take a look at the features, and they really pretty much match the iM20. Interestingly enough, Godox actually has a joint product page for these two products. Really, the only difference is the form factor of the flash, and it would appear that all the internal workings, the power, and the adjustment are identical. So you have the same flash bar, the same USB charging, and the same power options with five settings. You also have the power button that doubles up as a test flash button.
One of the big features here is that it’s so small and lightweight. Alongside your compact camera, you can also fit in this small flash. The lithium battery inside can be charged through USB Type-C, offering maximum compatibility. So wherever you are—if you’re off on holiday—you’ll probably have your phone charger or your compact camera charger with you, and as most of these are now USB Type-C, this flash will charge using exactly the same equipment.
When it comes to a full charge, you can then take up to 440 full-power flashes, which, considering the small size of the unit, is exceptionally good. And if you just want to get some real stark 90s-style portraits, then this is a great option. Obviously, you do have the ability to adjust the power output, and by reducing the power down, you’ll get even more flashes. If you are using it at full power, then it takes about three seconds for the flash to recycle and be ready for the next shot, which is relatively slow in terms of professional flashes—but at this level, who cares? Three seconds is worth the wait.

Unlike flashes of the past, the colour balance has been really well thought through, and you can expect a good, natural luminance from the flash. Results balance out nicely for your portrait and still-life photography shots and should mimic relatively natural lighting, although you are sure to get a few harsh shadows due to the position of the flash.
Those five levels of power adjustment are limited, but actually, they do give you a good range of control—and to be honest, it just keeps things simple, so you can have fun, concentrate on your photography, and not get too bound up with the complexities of flash.
What’s great about this flash is that if you do want to get a little bit more creative, then you can get the likes of the V100, slap that into slave mode, and use this compact flash just to fire off the larger flashes—creating a complex setup with just a few small and relatively cheap components.