I've had the Air Dock 2.0 for a few months now. The pad has lost its stickiness and no longer holds my Nexus 5 very well. It is constantly falling off. I've tried contacting them about this and haven't heard anything back yet. I can not recommend getting one.
You probably just need to clean it to get the original stickiness back. I'm still using the original airdock with no problems. However there is a noticeable difference between using it with a Nexus 4 vs Nexus 7. The Nexus 4 sticks like glue and I don't seem to need to clean the airdock periodically. This is because of the glass back. The Nexus 7 doesn't stick well enough without the sticker which creates a shiny surface, probably due to the surface and due to the extra size. When I was using the airdock with it I found it necessary to clean the airdock once a week, two weeks tops. Note this isn't limited to the airdock. Many people complained about the wireless charger for the Nexus 4 saying their Nexus 4 slides right off it. Same problem there, in order for it to stick, it needs to be cleaned periodically. I got one of those for free because the original owner thought it wasn't working. Wiping it out down with a lens cleaner restored it and I've been using it ever since without an issue. The airdock is actually much better, much more sticky than the wireless dock that was sold with the Nexus 4.
PS: by lens cleaner, I mean the wet disposable kind, not the dry cloth. Water works too, but your phone will not stick to the airdock while it's wet, it needs to be completely dry.
Sent from my SM-P600 using XDA Premium HD app