I have a Nexus 5 and bought the PowerBot. It was cheap and I wasn't sure I wanted to use wireless. I place the phone down with the "X" of "NeXus" roughly on the center and it chirps to let me know it's connected. If it doesn't chirp, and sometimes it doesn't, the light on the PowerBot changes from blue to green.
I've read quite a bit about Qi chargers and am considering buying one, I haven't really seen anything negative about using Nexus 5 on a wireless charging pad and that if anything, it is better in the long run as it doesn't cause stress on the mini-usb charging port at the bottom of the phone.