Works good and seem to find me everytime.
You might check out Aokatec i have for my D600 and it works well.
Yes I brought my in to Nikon in LA,CA and the replaced the shutter mechanism. You might see a new D610 out soon that will replace the D600. We will have to wait and see about that.
Dont you just love that place. There is so much to photograph.
I hope to go back soon