It wasn't long ago that the FDA banned fat burners containing ephedra in the united states. This made it much more difficult to find a high performance fatburner supplement. Of course, ephedra was regarded as unsafe for human consumption, which is why it was removed from over-the-counter products. So, while it may be harder to find a really effective fat burner, there are less risks to worry about without the ephedra.
Whether or not removing ephedra was right doesn't really matter at this point. Now it's time to move on and find a new weight loss supplement that gets the job done without the use of the banned ingredient.