I did back to back trips with this itenerary and both agree and disagree. I found Apo to be a bit disappointing as we saw few of the famed big schools of pelagics the area was famous for. We did see plenty of other thigs, including plenty of nice banded sea kraits.
Coron was also poor vis for us, but the reef growth on the wrecks was wonderful. saw lots of great macro subjects. The reef life at the very touristed snorkeling areas were also very nice with plenty of photo subjects, including some really nice mandarin sites. I really enjoyed Coron, even with the limited vis.
As for the Siren, I found it to be very comfortable and great crew. I had no problems with the food at all. I sometimes wished we had fewer meats and more seafood, though. The only drawback, for me, was the photo table, as you mentioned. We had to take turns using it and a couple of photogs were not very cooperative with the rest of the photogs. They stored their stuff on it making it hard for others to use. I liked the camera drawers for the crossings!
Would I go on the Philippines Siren again? Absolutely! Would I do the same itenerary? No.
