I've been using this system for a couple of months in both 5-boxing WoW (7 teams) and 6-boxing EQ2 (3 teams). Lax has done a fantastic job of creating a system that works well for most (all?) games. Just using this system forces you to think about your abilities and how and when they should be used. It does take extra work to set up but I think that is repaid over time as the system is very flexible.