Don't know if this is much help (I'm using a Sony Xperia X), but I needed Anbox for two reasons (and it worked even thogh the Xperia is not listed as one of the supported devices):
First, I can't seem to go without WhatsApp, since most people and a few essential groups aren't willing to switch to other messengers. It's not as stable as I wish and typing takes some patience. Since Anbox installs a few standard apps I could use the settings app to change the language/keyboard in WhatsApp which makes it much more comfortable. Most of the time I get notifications about new messages in a seperate window, even when not running the app, but not in the notifications bar (like for example Teleports messages). But it's not reliable. I need to check from time to time.
Second I really don't want to miss Spotify which I also installed using the apk-file. It runs perfectly and reliably and I'm happy!
I can't really tell whether it's using much more battery power, since I installed Anbox right at the beginning.