I have been using Akadama as part of my mix for more than 6 years and have had outstanding results. I use the "Boon mix" (1/3 Akadama, 1/3 lava, 1/3 pumice). Of course, Boon teaches us proper repotting, watering, and fertilizing techniques, without which I wouldn't recommend it. If you can't find Akadama you can substitute more lava.
In what part of the world are you located? Are you a member of any local clubs? What are those in your area using in their soil mixes?