It all depends what you want to learn. For instance, from this wbsite I viewed Gae Beck and Choon Jang. He puts in extra Kihaps, misses the step over for the side Kicks in Gae Beck, doesn't seem to have the stamping motions in Choong Jang and adds extra kihaps. If your instructor reccomends this the use it. Other wise you may be just be doing the wrong stuff.