It makes working on and understanding the ion a breeze.
None that I see.
I picked this up while I picked up the Lightening Bolt. I just wanted to see what it was all about. I must say, I was very impressed with the instruction, and the video quality. It was very professional, and well put together.
I didnt really need the DVD because I already knew how to work on my gun, but Ill be honest, it taught me a thing or two.
Overall, if you are new to the Ion I think that this DVD will really help you out. You'll be much less apt to break your gun when you try to grease the bolt. It also shows you how to adjust the dwell, rate of fire, and firing modes.