Is anyone using SLI with two monitors for multiboxing wow?

http://www.slizone.com/object/sli_multi_monitor.html

According to this, their later drivers support the use of SLI with 2 monitors. I was curious if anyone is seeing any performance gain for SLI. They dont specifcally mention using 3d applications in both monitors unless its specifically supported which id say on the safe side doesn't include wow. The only example they use is a 3d game in window mode on the primary monitor and a web browser in the other.