Thought I'd give my thoughts on Dressel Divers at the Iberostar Paraiso.
Also did the Gorilla package consisting of the 11 dives. The pre-trip business of communicating with and booking the dives was very easy. Although based in Spain, everything (my questions, itemized costs) was communicated quickly and the process of payment was easy with a quick confirmation. Scheduling dives was done once I arrived and made contact with the dive shop, all done by using the WhatsApp texting app. Replies were always quick and the app made it easy to check on anything I had questions about and scheduling future dives.
The staff (instructors, DMs, people who took care of gear, drivers) were exceptional.
I want to explain a few of the reasons (and the good/bad associated with those reasons) I chose to dive with Dressel at this location.
1. They had pickup/dropoff from the resort we stayed at. These times were set at picking us up in the morning and leaving the Iberostar Resort at 4:00 pm. Having dive times of 8:30, 10:30, and 1:30, no matter what dive times you went with, the transportation home was always 4:00. Also if they did only the 8:30 and 1:30 dives, you had to wait around at the resort which is all inclusive, so you couldn't buy food. My buddy and I took sack lunches 2 days.
2. They had a free AOW course (course materials had to be paid for though.) On just about any dive, you could fulfill one of the 5 dives for AOW. Although there may have been several groups on the boat, there were generally plenty of instructors so that one would be there to have you complete the skills for a particular dive. The negative to this was that there may be several divers in the group diving for fun, but having to wait until the student(s) completed their skills. The only AOW dive that was just students, my buddy and I, and instructors was the navigation dive. There were still other groups out on the boat though.
As it turned out, my buddy, who has been diving regularly since 2008 with his PADI Scuba Diver certification (gained in 1975) was deemed not to have his Open Water certification (no record with PADI although they showed his Nitrox certification.) The staff allowed him to take the course for free except for the cost of course materials. He was so appreciative but had to complete this before he could complete any AOW dives. He was still able to accomplish everything within the 11 dives we prepaid for in the Gorilla package.
3. The Gorilla package included 1 night dive, 2 cenote dives, 2 dives in Coz, and 6 dives from the Iberostar Paraiso. Wading to and from the boat with all gear on (minus the air tank) in strong waves on the 6 dives from the resort and the night dive in Playa del Carmen from the Iberostar Playacar wasn't fun. On the night dive, upon return the boat stopped 100 yards out and you had to back roll into the water with gear, less air tank, and swim to shore. The cenote dives had us going to another Dressel in the Barcelo Resort to get needed gear before traveling to the Tach Majal cenote. These were nice dives and I found the water to be warmer than expected. Had 77 degrees F on my computer. Probably could have worn the 5mm instead of the 7mm that was provided. The Coz dives were by far the best (as everyone knows they would be.) Calm water and very good visibility. The visibility on dives from the mainland was poor (was good for the navigation skills) and the water at the surface was slightly choppy. On all dives from mainland the different groups that left the boat came up in different places, so you would have to wait for the boat to locate and then pick you up. We were there the last week of Oct. and the first week of Nov.
Last comments: Realizing that Dressel is dive shop on a resort which is not a dive resort, the schedule is set. Dive sites were repeated many times in my 6 dives there, and dives were planned for 45 minutes to depths of no more than 45 feet, although I hit 50 once. For convenience, if I stayed at the resort, I would dive with Dressel, as it is a nice set up where you can safely leave your gear and have it taken care of, but having stayed at a different resort and knowing what I know now, I probably would take a taxi to a different dive shop as I did in a previous trip, going to Puerto Morelos.