I just returned from a 2 weeks trip to Tulamben.
I first met Yansu 7 years ago, when he was still working for another dive operator.
He impressed me as one of the best dive guides I've had during my 34 years of diving, so when I heard he has started his own business, I didn't hesitate to contact him.
When he couldn't dive with us, he trusted us in the hands of Kadek, another excellent dive guide.
The business is still small, and couldn't offer us accommodation, but they are already building new facilities. There are already enough people to ensure you a memorable experience in a diving paradise: instructors, guides, cooks, drivers and maintenance staff. After opening your gear box, you can leave your equipment in the cunning hands of the staff. It will be washed and taken good care of throughout your stay.
People come to Tulamben to see small stuff. Macro photographers fly there from all around the world to make pics of creatures you only see in a few other places, but there the critters are all gathered on a relatively small area. If you want to see bigger stuff like Mola mola (June to September) or manta rays, there are trips to dive spots nearby too.
Yansu is a photographer too, and he probably knows your camera at least as well as you do, so he can give you useful hints (if you have new equipment and feel insecure with it, he'll even take some photos for you to ensure that you have at least some good ones ;) )
I can warmly recommend the services of this small dive operator and its friendly and effective staff!