Re: Question on different schools
I can say for sure that the Tenshinkai lineage is a quality one. Although I don't know Tran Sensei personally, I can vouch for his teacher, Dang Thong Phong Sensei. He is a most respected figure in the Aikido scene, and is accomplished in other arts as well. Any instructor who bears his endorsement will be most capable. Look for Phong Sensei's books in any quality bookstore and for his Westminster (CA) Aikikai site on the Web.