I tested these with a Canon R8 during a weekend long comic convention in which I was actively using the camera for several hours at a time every single day, taking hundreds of photographs (along with some video). The listing accurately points out that the R8 will not display the battery level when using these batteries, and I initially thought that would be a nuisance at first since a drained battery would mean the camera could shut off on me at any moment without notice. In practice I didn't find it to be an issue at all. I did not actually reach the shutoff limit of any battery over the course of the weekend, instead I just proactively swapped batteries whenever it "felt right" to me based on my experience with Canon's batteries (a process that only causes a few seconds of downtime).

I think this is where the strength of this product comes into play, providing you a sheer quantity of batteries to swap between compared to the far more expensive proprietary ones. I've found mirrorless cameras like the R8 to make relatively quick work of LP-E17 batteries and so it's crucial to have a few spares charged and ready to go at any given time. I do already happen to own a few other K&F products and have personally come to trust the brand as a source of both quality and value, and they've once again delivered with these batteries.

The lack of battery charge display could (and should) still give pause to certain types of photography scenarios - I personally wouldn't rely on them for something like a wedding where a suddenly-dead battery would be disastrous should it cause a once-in-a-lifetime moment to be missed, nor would I rely on them for recording longer-form video of events in case it does happen to die in the middle of a long take. Otherwise I can't really see it being an issue for any type of photography done in a studio environment, or for landscapes, street photography, astrophotography, wildlife, travel, architecture, and more where you can afford to spend a few seconds swapping the battery as needed. While it is ultimately a downside to not have the charge display with my particular camera, I don't see a need to dock any points on my overall rating because its specifically stated up front what to expect. Beyond that missing (proprietary?) feature, these batteries seem to have a build quality and capacity every bit on par with the official ones.

The included charger can thankfully charge all three batteries at once (the official Canon charger only handles one battery at a time), and the display gives a nice and simple indication of where each battery is at. It only comes with a USB A-to-C cable, so you can't plug it directly into a wall without having a separate charger (input 5v 2.4A).

As a little tip, I would recommend using some masking tape or small stickers to label the top of each battery so that you can easily keep track of which is which.