I'm confused in that too, I don't see a really huge difference using gamerail or not, maybe my d-link router that have a gaming mode just do the same work, I'm going to uninstall it to check my theory
well, I'm playing right now in the new 2fort server and I have the same ping with gamerail, maybe when the technology is more mature will be a good choice but for now I'm sticking to my d-link router