I am also using Google Nexus 5 its really a beast running high end apps and games ultra smoothly I will recommend every one to go for nexus series because it serves better then Samsung apple htc moto etc. stock android is really what everyone wants. and the best thing about it is that it has a reverse charging option too I have charged it through usb from another smartphone.
I am really feeling like a man with this device Google is really doing better. No disappointments at all Just the best thing ever.