CenoteXperience is a solid operation, and were very safety- and environmentally-conscious. We communicated easily with Nicolas via Whatsapp, and Carlos was our dive guide for both days that we dove with them in August. There was just the two of us with the guide on Day 1 and one additional diver on Day 2. We dove with our own equipment (backplate & wing), but they provided the thicker wetsuits (5mm if I remember correctly); the dive guide dove with double sidemount, and mentioned that it was required for the guides to have doubles (either back or sidemount) for safety reasons.
They picked us up each morning, stopped by their shop to sign paperwork and get wetsuit and any missing gear, then we stopped by a small shop to get sandwiches (included in the price), additional snacks and water were provided during surface intervals at the cenotes, and at the end of the day we were dropped off at our hotel.
Day 1 - El Pit; Dos Ojos (Barbie line); Dos Ojos (Bat Cave line)
Day 2 - Angelita; Dreamgate
Personally, although the caverns like Dreamgate and Dos Ojos were cool to see, I prefer the landscape and interesting haloclines in deeper cenotes like El Pit and Angelita. If I were to go again, I would probably just stick with these types of cenotes and skip the shallow cavern dives, but that's really just a personal preference.
We paid a small deposit ($60) via Paypal to reserve, and then the rest is paid by cash or card after the dives are completed (there is a small fee to pay by card, but I forget exactly what it was, something like 2-3%).