We had this done while staying at GF not long after they started it and the photos were in general amazing. They took about 80 and about 60 were good (ok most of the ones I didn't like had me in them). they took about 10 of DS on his own, 10 of DD, 10 of them together, 10 of DH & I, about another 10 of DH with DS, then with dd and then of me with the two children in turn and then the final 30 of the four of us. We still have four framed in our living room.
they even gave us advice on the colours that work and the colours that don't. We were told no whites,yellows or patterns from memory. We went for navy and blue so that dd who was 5 at the time could wear her Cinderella dress. They started inside the GF, went down the back stairs and took some of the children sitting in the window seat, outside by the beach and finally some in the carriage and vintage car at the front.
At the time they charged a set fee to put them all on a disk for you.
Tempted to do it again this year but at Poly prior to our Spirit of Aloha reservation but DH doesn't want to timetable too much - he's not got a hope in hell as we are on the dxdp.