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Hi Kiwilassee,
I cannot offer comparative advice, since I just have dived with one operator in the Greek Islands. I was in Mykonos last summer, and found "Dive Adventures" in Paradise beach through the internet, and contacted Costas, the owner of the shop. I decided to go with this operator because I was impressed by the information in their web page and I really did not know who else to ask -- I had not yet found Scubaboard then. I actually was very pleased with the shop and the people who worked there: friendly and professional. You can visit my web page and see some photographs of my dives in
Mykonos at
http://www.inaoep.mx/~itziar/images/mykonos0306.html. You have a link to the shop web page there too, in case you are interested in contacting them. Dive Adventures caters mainly for the ocassional diver hopping through the islands, but we did 11 dives with them and were very pleased with the dives and the care they took of us. My husband and I had recently obtained our OW certifications, and felt very confortable with the advice and supervision provided by the DMs, who were not oppresive, but would always offer their best counselling when asked. I observed that they had a good bunch of students too, but they taught in a private or semi-private fashion, so although the courses were a bit more expensive than here in Mexico (or the US , for that matter), I thought it was worth the money. The wife of a friend of mine, a Greek, took the OW course with them a few month afterwards and she was extremely pleased with both her teacher and the shop as a whole.
As for marine life, in the Mediterranean Sea I did not see any turtles, and in general, I thought there was less variety than in the tropical seas I have dived in, but I actually enjoyed the fields of sea grass, and saw a bunch of groupers, jacks, eels, octupus and sea stars. And I saw some antique amphoras too!
If you have the chance, there or in any other island, do not miss the oportunity to dive. It will always be different from Scotland, right?
Cheers,
Itziar