Replaced a eufycam 2C with the S3 Pro and the difference in image quality was amazing. I was initially concerned that the built-in solar panel would not maintain the charge, but it keeps the camera fully charged with only a few hours of direct sunlight.
The S3 is a great camera with only one drawback. Because it is powered by battery and solar, it limits the amount of time that it will record a video before stopping. This makes some situations less than ideal, especially for scenarios where the camera doesn't record often, so when it does you want it to capture everything for as long as possible. Ideally, you would be able to by-pass this setting with the understanding that the battery might get depleted and you will no longer have camera coverage until it's recharged by the Sun.
Quite shortly after purchase my S3 Pro (along with 6 other eufy cameras and doorbell) were lost in the Palisades Fire. On the plus side I got to see embers blowing around my house and ashes swirling on the garage cam.