This is a summary on my experience on using this setup.
It's great for indoor shoot (small room). I could just set it up on a light stand and I could trigger it with CLS without any problem. I didn't even need to worry about the on camera flash needed to be line-of-sight of the SB-800 sensor. The CLS signal could bounce off the wall/ceiling and triggered the flash.
It's great for outdoor shoot if I used a long lens. If I used my 18-200mm or if I didn't get too close with my 50mm, the SB800 was triggered without problem. I need to make sure the on camera flash was on the line-of-sight to the SB-800 sensor. The results were great too as long as the flash was triggered.
It's not great for outdoort shoot if I use a wide lens. If I used my 12-24 and if I need to get close, the SB-800 sensor would not be on the sight of the on camera flash.
My conclusion is to use a long lens if I want to use CLS with the Ezybox outdoor. If I need to use a wide lens, then I will need other form of triggering instead of CLS, maybe a SU-800 or a pocket wizard.
Here is a picture taken using the Ezybox with Nikon SB-800, triggered by CLS via the on camera flash. The flash was set to TTL.



