G'day mate, have the factory heat grips on my 2014. Paid for them on my order, but they were on back order when I picked up the bike (October 2014). The plan was to have them fitted at the first service, but were still on b/o. Wasn't in a hurry (summer here) and forgot about them until last month. Called the dealer and they had been there for 2 months but forgot to call me. Asked them to send them out so I could fit them myself to save time running it back. They were happy to save on labour, and printed out the workshop instructions for me as well. The install is very easy (harness plugs under lhs fairing) but the supplied harness is too short, making it a little tight around the steering head. If I knew what I new now b4 I would have gone for Oxfords, because the parts all come labeled Kawasaki but the parts stickers for the grips (labeled made in japan) are over the manufacturers labeled made in China and the controller is made by Honda (which was actually reassuring).
They definitely aren't worth the "Factory" premium, the grips don't get that warm and dont feel as good as the Oxfords.
Cheers.