Only know Two Fish, but one of their dive guides, Opo, has many years of experience, and arguably the best guide in Lembeh Area. Seems to know where everything is. You see it, and he can open up the book and show it to you.
One thing he taught me, if you're not seeing enough, go slower.
As I understand, NAD has strong focus on UW photography, if you're doing that.
Another place to consider is Bastiano's, which is between the two. Stayed with them 3 years running, usually about 3 weeks at a time. I really like the place, and rates seem reasonable. Also AC, and it does make the nights far more pleasant.[/QUOTE
Opo is a very nice fun guy and a good spotter. But if you want an amazing Lembeh specialist then also consider some of these guys.
Ben @ Lembeh Hills
Iwan & Detmon @ Eco Divers
Paulus @ Lembeh resort ( whatever name they are using for the dive op this year )
Liberty @ KBR
Nus @ Kasawari
Henky@Black sand ( not sure if he still there )
These guys are some of the original Lembeh diveguides and really outstanding ( just ask Nat Geo, BBC, Animal Planet and the thousands of guests they have made happy). Lembeh's dive operations have increased 5 fold in the last few year which means that u now have a bigger demand for dive guides. A lot of the Bunaken guides are not overly keen in doing long stints in Bitung so most of the guides are local based. Unfortunately this now means there are not enough experienced DM's to fill the gap. Diving on a wall outside of Lembeh or in Bunaken u can normally get away with an inexperienced guide but in Lembeh it can ruin your trip. Don't get me wrong it is rare not to see anything but and experienced Lembeh guide knows exactly where to look rather than hope. I now see some high end resorts boasting they have some of the best dive teams in the area when most of them until very recently were compressor boys and boat captains. It is something not much discussed here but so important to a Lembeh trip ( especially on a return visit ).
NAD does have more comforts on offer and permanent experienced management on hand. Mike & Simon are 2 very well known asian based photographers but that does not mean it becomes a photo resort. They both have a lot of years in the biz and did long stints with the Aggressor fleet so understand first hand what high end service is about and how to cater for your needs. If u are a photographer then you can learn heaps from them. If not then they will not put u in a camers intensive group. Remember u r only diving in groups of 3 or 4.
Hope my experiences have helped.