SCUBA Junkies is a professional and capable operation, if you're looking to dive in Sipidan. Although you have to buy a package, I found my four day, three night package quite reasonably priced and worth the cost. SCUBA Junkies has a sustainable philosophy, focused on improving the environment around the area. While this is somewhat difficult to believe given the amount of trash on the beach and on some of the reefs near to Mabul, their overall attitude does seem to believe itself to be one of environmental sustainability. Additionally, in comparison with other dive operations on the island, they are much more attentive to the environment, to protecting the precious animal and plant species, and to generating a long-term sustainable operation.
Regarding our actual stay, we stayed in one of the air-con rooms and highly recommend it. The room was tremendously comfortable, with a private bathroom, fan, and air-con. After a long day of diving, it was nice to retire to a private room and relax in the cool.
Food was good and plentiful. As a vegetarian I never went hungry. There is typically a grain (bread, rice, pasta) as well as some meat dish (and a vegetarian counterpart with potatoes, tofu, or other vegetables), as well as vegetable dish. There was usually fruit. Cake, tea, and coffee were available throughout the day. Wifi and related facilities were good, as well. I was traveling, but still had work to do, and was able to send emails and communicate effectively with my colleagues.
To the diving specifically, while everyone comes to dive at Sipidan, the dives around Mabul were also very enjoyable. There are some good created environments, as well as generally pleasant coral environments. Macro diving is particularly good in some locations. Sipidan hardly needs comment, given its reputation.
All of our DMs were phenomenal. They were patient, attentive, thoughtful, and great at spotting animals and plants. The well defined hand signals ensured that everyone understood what we were looking at. I had an issue on one dive and our DM patiently and calmly dealt with it, even though I was a bit panicked. I would recommend SCUBA Junkies purely based on the skills and attitudes of the DMs.
I would go back to SCUBA Junkies without hesitation and recommend it to anyone considering a trip to Sipidan or Mabul, generally. They're professionalism can sometimes be brisk, but really speaks to the capacity, excellent, and organization of the operation that they run.