Ok, I guess I have to give a few details since no one who have done the trip with Walter have stepped up.
First of all, Walter "Meaty" Bernardis is a friend and I have recommended him to a few other WP members before. There are a few things potential customers should note:
1. Walter skippers primarily for charters during the "busy" period and the other boat(s) is skippered by someone other than Walter himself obviously. He only runs his boat for non-charters after the charter guys are gone.
2. His main boat allows multiple tanks for customers, but the 2nd boat (RIB) is more limited in space and filled with up to 6-8 customers.
3. His operation is one of 3-4 ops that have aircraft for spotting and also fun rides for customers.
4. Mboyti Lodge is remote and as of 2010, still does not have GSM reception (you'll get that at sea!).
Wetpixel will probably be organizing the Indian Ocean Safari for 2012 as well, for 3-4 photographers only, which is open to the public to sign up.