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the apple site says its fully compatible so no need to worry about anything bad
Funny thing. I wanted to look at the specs but can't find the 12W charger (neither in the German nor the US store). The link goes to the US store and shows ''Cables and Docks'' for iPad. When selecting iPhone it shows the 5W charger, so it should be the right category.

Do you have a direct link to the 12W charger?
 
Of slight interest, I believe that the iPads now ship with the 10w charger. I had thought that the 12w adapter was going to be discontinued, but it still seems to be available almost a year after Apple went back to shipping the 10w adapters with iPads.
I can confirm this just bought a iPad Air 2 LTE from AT&T and it shipped with a 10w charger.
 
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