Yup, I notice some little improvement. It manages to make my WiFi on and off according to my usage (previously, Google will force WiFi on all the time for location pooling for Google Now and who knows what secret they have). If you let Battery Guru to disable most push services (which I didn't) you should be able to get more battery life, too.

It comes with a nifty companion app called Glance which offers a very interesting concept. Try it out (I decide not to use them because it breaks the Holo look IMHO).

so far i haven't see anyone using nexus 5 out there. my phone has been molested a lot by my friends. they even comparing the speeds with iphone 5s(like pick and send the image in whatsapp speed,etc) and n5 nvr be the last.

they even wanted to get one until they see the camera performance is not up to par at all