Put them on at 600mi. Love them. Have done back to back 400 mi days, with them and a gel pad to sit on. Only complaint is that my CRG Roll-a-click clutch lever hits the little switch (I think that's what it hits) under the left grip, and prevents the lever from being rotated down enough to be optimal. Still deciding whether to grin and bear it, or see what can be modified to make it just so.
Otherwise, I think it was a great change. I actually rode a demo with stock clip on bars for about 1500 miles, while awaiting my bike. FWIW, I've learned that much wrist anguish, etc. can be avoided by positioning the body with knees and abdominal core, with minimal weight on bars at low speeds. Better for cornering also.