Great ROM, thanks for keeping this device alive.
ROM seems smooth except for a few issues I have found,
I dont know which screen I have but i found that the brightness does not go as low as other devices so the screen seems brighter than it needs to be.
The screen on time for me seems to be 2.5 hours, so not very great but the sleep mode of cm13 is great for when not using the device.
I found that WiFi seems to take a moment to start doing anything when requested to do so. Loading webpages, video and so on takes a to longer than it should, seems to idle for 5 seconds then start downloading the data.
I found that taking a photo through whatsapp and pressing send would cause the device to crash, once the app loaded up again you could send the image no problem.
Like other people have commented I did notice the camera exposure to be rather dark.
I am not sure whether its my device as its not an issue for this rom alone, I also found it on MIUI and CM12.1 but the torch app sometimes disappears or wont actually turn the torch led on even though flash still works in the camera.
Thanks for the ROM though, glad to see some development for this device.