I just took this course, Deco/Helitrox, with Steve in August. I was planning on doing Adv Nx and Deco, but was given the advice to add the helium aspect, I would be thankful I did. I was thankful. The course was really well done, and Steve was a great instructor, made the dry theory interesting and enjoyable, and broke up the theory with diving. If I remember correctly we did it over 6 days which was great, did a few shallow dives where the focus was dealing with the added gear and the work load, getting used to switching bottles, and the new buoyancy aspect of carrying deco bottles. Once comfortable with that moved on to the deep dives. Great course, great instructor, and am happy that I now have Adv Nx, Deco, and the Helium.