I have a set the I've had in my bike for just over a year now. I changed them out with only a couple thousand miles on the plugs I had at the time. The bike seemed to start a little faster, and the bike does seem to want to run..... hard to explain. I always keep the old set in my bags just in case, but I haven't had any issues. Would I buy them again. .... I don't know. When I change my wires in a couple of months I may change back to my old plugs to see if I notice a difference.
Sent from my SPH-L710
2010 FLTRX With Plenty of extras, goes by the name "Hardeshia"
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Also not pictured 2016 FLTRXS and 2017 FLTRXS, you never can have too many SHARKS......