Interesting question....Little history of me 1st....1st & only time we dove CZM was '89....From there we dove G. Cayman for about 5 yrs, it became too crowded, then on to Roatan, bought a beachfront house there in '94 & have been there since-- till last Oct, friend of mine,fairly new to diving, talked my wife & I into a trip to CZM....well, the diving I found was excellent, saw more 'big' animals than I had seen in several trips to Roatan... On one dive, finishing up Devil's Throat @ Columbia Reef I think it was, 6 spotted eagle rays swan under us @ 40 ft-we were at 20 ft drifting our safety stop....Another dive, we saw 3 different nurse sharks- one was under a ledge with a big green eel sitting beside it......I think some of what good happened to us was the dive shop we used, Aldora- for instance the 6 eagle rays we would never have seen due to lack of BT time on that dive- it was a 140ft./1hr 15 minute dive with deco & safety stops we had to make.....If you're not familiar with Aldora, they are a little more per dive BUT your bottom time is unreal, must use a computer to get in the water with them, check them out next time, well worth the extra $$$, IMO...(they use 125 hp steel tanks so bottom time is ALOT......you MUST BE CAREFUL & watch that computer......Just a short review but I was extremely pleased with the 'shape' of diving in CZM....btw, us 2 guys on that trip are heading back March 7 thru 11 to get in about 12-13 dives( in 4 days) of course with Aldora....My recommendation is to check them out, you may want to go with them or not.......Aldora.com is their address, and their villas they just started last year are very good & a very good value, right there on the water too......good luck, I would not give up on CZM just yet........