We arrived on Koh Tao not knowing which Scuba school to attend but started out at Big Blue as it was recommended in Lonely Planet and on Google. From the start we liked the vibe of the place and people.
We started on the OWD training the same evening. Our teacher was very patient with us in the pool and when one of our party couldn't manage the mask removal to start with he stayed with her after the rest had finished all their skills until she was able to do it.
When we went into the actual ocean the next days everything was explained to us in detail and at no stage of any of the four following dives did we feel left alone or unsafe.
Two of us even decided to go on to do the next training course and after five more fantastic dives we can call ourselves Advanced Adventurer :-)
All in all we highly recommend Big Blue Diving and will return for sure!