I am a new student in with an SDI instructor. AFTER beginning classes and searching on the internet, I realized that there are several different courses out there. My instructor had us watch a DVD, read the SDI coursework, answer the questions - then reviewed them in a brief classroom setting. We now do 4 to 6 hours of pool work, then we do 4 dives. Through looking at other dive centers on the internet (none of them close to me), it seems like I'm not doing as much classroom work as most - My question, should I be concerned? Will my certification be as accepted as a PADI or YMCA certification? Should I continue on thru another agency? SDI teaches with the aid of dive computers - is it safe to just learn relying on a computer...??? Any advice?