I shoot in Raw NEF from the camera. When I import into lightroom I have lightroom convert into DNG. A couple of reasons I do this is that once you edit the image the edit info is stored inside the DNG. Native camera raw files will carry a small side car XML file in the same directory. I guess I just got tired of extra files. I like have just one with all the info. I also tested from my files and really could not see any differences in image quality between native and DNG. Plus the DNG were smaller in size. With all that I really did not see any real benefit to keeping larger native RAW. I have been using DNG for a couple of years and have no issues. I guess I will continue.