I think the idea is that the increased contact creates a more consistant spin, and also increases range, which to me sound just like a classic LRB barrel system.
I can understand that in the theoretical sense, but in reality the G-Hop or whatever you want to call it only increases the overall contact area by what, 10 square milimeters? Compare that to using the ENTIRE lengh of the barrel as a hop up surface as with the LRB system. I'm not an expert on anything, I'm pushing ideas around. Prove me wrong or add on.
The way I think of the whole system is this: Why you apply hopup using the conventional nub system, the bb passes by both the nub and the bottom of the barrel at the same time. The nub offers more resistance, and so the bb spins back. However, the barrel still imparts some friction onto the bb during that moment, added inconsistency to the hop. Now, when you increase the surface area of the nub, you also increase the time frame where the barrel can added inconsistencies to the system.
Also - spin is spin. The bb will be spinning at some RPM no matter what system you use. The system may be more consistent, or give more range than the previous system because the spin is more finely tuned, but no system (in my mind) will 'magically' give you more range. When classic owners claim that they get more out of their LRB's, this is true, to a point: The design of the barrel in the LRB system has the bb's exitting the gun at a downward angle, maybe 1 or 2 degree. They compensate by 'overhoping' which is allowed because the barrel angle.
Now that I've stirred the pot, I won't have internet access for a week