I went throught the ranks and got a 2nd Dan, so I could see the difference between ATA and my original WTF training. I moved up relatively fast because I already held Dan rank in WTF, and this made it easy to perform all the required techniques. Along with that, most of the ATA Masters I studied under, were ex-WTF Instructors anyways, so I was able to adapt easily to the Songahm style. One good thing about ATA I must say, the Songahm forms are more challenging than the Pyong-An and Taegeuk (let us not forget the Palgue) forms IMHO. Since those days my membership has long expired, because I'm not a continual participating member.