We have been diving with Del Mar Aquatics about 99% of the time. One day during Nov/Dec 2008 the port was closed and we had the concierge at CDM hunt down someone going out that day on a boat.. found the dive op over by Fiesta Americana was going out and went with them that 1 time.. Other than that, I always use Del Mar Aquatics.. I have never been bumped and have been diving with them since 2007, my wife since 1994. Their videographer, Ceasar, is top notch and doesnt charge you to come along. He videos and later presents the video at CDM dining area where you can choose to purchase or not.
We have stayed a couple of times at CDM and we really enjoyed it. When we stay at a hotel, we dont do all inclusive and prefer to drive into town to eat at random locations.
Now that the kids are all certified, hotels dont cut it for us and we do house rentals. We still dive with Del Mar Aquatics and they come and pick us up every morning and even bring along extra tanks if we want to shore dive. We just request what we need and they have never given us a hard time or anything.. Always a pleasure to dive with them and they often let majority rule the boat so when you show up as a group you can choose where they dive that day.. (which is good since I hate diving the C53 or whatever the boat is)..
If they know you and see you are skilled, you can get them to take you just about anywhere.
For a diver and his family that like to be catered to while on our dive vacation, there is nothing better.
I will add that shore diving in front of Casa Del Mar is great! A wide array of sealife to check out nearby.