Having had both experience with voodoo and gorilla boy, I have to say that each has pros and cons like any bag, but to tell you the truth, I enjoyed the GB more than the voodoo. Now this is just my situation, in this case I am comparing the karma and silverback. The karma I noticed had become much too bulky, and it can put a good strain on your back. I can't speak for the mojo though. It had tons of pocket space however and could hold up to 42 discs alone. The mojo could probably hold up to 30. The silverback could hold up to 20 by way of cramming them in all the disc sized pockets. However the water bottle pockets were nice and roomy while remaining tight around the bottle so the don't fall out.
In addition, the GB felt very nice on my back. To sum it all up, both bags are well made. Plasti dipping is recommended on the bottom of the GB bags though as they are more prone to ripping. Voodoo uses the best materials inside and out and the frame is one of the toughest I have ever seen or felt on any bag. However when all was said and done, I have wanted a Grip that I couldn't afford as it combines voodoo's durability and space without the back pain, but I settled for an innova competition bag. It has all the space I need and feels light on my back.
To sum it all up, know your body's limitations and decide your bag on that first. If you have back issues, your best bet is to invest in a GRIP or something similar or GB for great well made home made bags, but if you have a strong back, look into voodoo. They are the best of the best when it comes to traditional style bags.
