R6ii Owner here that was definitely hesitant about putting third-party batteries in their camera, but so far I am satisfied with their performance. In the event anything changes, I will update this review.

Like many other "non-OEM" battery alternatives, they boast a slightly higher capacity, but I believe whatever environment you're shooting in will have a better impact on battery life. The main convenience with these batteries and chargers is that I can swap off the huge OEM single charger blocks, and switch to something more compact and universal (USB-C). If you're someone that travels with camera equipment you could definitely ditch the single charger and pick this up to charge your OEM batteries.

Like majority of all third-party batteries, this battery is not UL rated, so bear with caution of the potential risk of damage to the camera. These, however are a great alternative/backup to my current set up. I have used 2 different sets of third-party batteries and got error codes with the camera fairly early in the shooting process, and have had no issues thus far with this brand. They also have great lens caps & filters.