I have had heated grips on all my (four) Sprints (and on my VFR800 before that) and consider them to be one of the most civilised of motorcycle accessories.
I bought these in July 2009 and fitted them to my red Sprint (the one that was destroyed by White Van Man) and transferred them to my current black 955 in July 2010. In total about 10k miles.
I wonder how long it will take to wear through to the wires?