It got multi-day battery life out of the box, which is far in excess of what Google advertises for that hardware.
Once I installed google play services (which have zero end-user benefit, other than enabling compatibility with apps that have bundled google spyware), battery life more than halved, bringing it in line with what Google claims.
I suspect anti-trust and consumer protection lawsuits would start flying around if more people realized that over 50% of their phone battery was there to support malicious bundled code.