From Glen Roy at grid 308891 at bridge. Climbed up very steep pathless heathery slopes in an anti clockwise direction to reach summit ridge. From there it was an easy gentle walk to top.We decided to retrace our ascent route for the descent as the slopes on the other side of Coire nan Eun were extremely steep. We took a longer loop to descend by a small gully which was a bit easier. 3.5 hrs in total including stops. Distance was 5.9kms. Would recommend doing this one. A little toughy but well worth the effort for the stunning views from the top. A nice little burn at the end to dip hot tired feet.