I only ever used it twice. The first time was on Golgoroth, back when it was very first discovered, and my team basically forced me to do it. It was either: 1) Do it and feel like a total scrub, or 2) Don't do it, and stay in the fight forever because of an incompetent team. The second time was in the first or second IB of Y2. Some asshat on the opposing team was using it against my teammates, and I returned the favor. Both times, I felt so dirty and cheap.