i have my open water through Put Another Dollar In and am thinking of going to the advanced open and then hopefully further, i have looked at the requirements for the courses as listed on here for the SDI program and admit that you need a lot more experience than just do 9 dives over a few weekends and be an advanced open diver!!
this can only be good for the divers involved to have more experience, so far i have 34 logged dives (no, that doesnt count the 3 min dive to 3.3 meters at portsea pier with Tony and Mark

The Question i have is (finally they say!!) how hard is it, or does it actually matter, to change from O/w Padi to AO/W from SDI? is one able to do a course from group S and then another "specialty" course from group P and have the other groups skills course recognised?
as an aside i think from the diving i have done that i think the SDI might be a better option, but would like to hear some input from others with their own tales of crossing over or staying in one dive school.
thanks from neil.