Here's my take, On my mtb they were great, I was running them at the recommended OCP which were 2. I had a very aggressive setup on my mtb and the powerstroke were in the sweet spot. On my road bike, same setup, recommended OCP 3, however always felt that the powerstroke were to soon, however I had great acceleration from sitting in the saddle and powered my way across any gap. However climbing and sprinting suffered as I always felt that I was to far forward and that the sweet spot was already over, because now I needed to have power but the chainring were going down to 50 and my pedaling felt "empty" I tried OCP 4 on the road bike and I just couldnt get used to it, on climbs I had to stand a lot to get some power and on flat roads, my knees were coming pass my ears to get some power. I've had my fair share of knee problems over the years, hence my move to qrings and it did what it was suppose to do, take pressure of my knees. I've gone back to round rings because that one day when I'm head to head sprinting for the line, I dont want to think that I need to place my weight over the saddle and not to far forward, because then I wouldnt have that big gear.
