I signed up for NEXUS. I'm waiting for my interview @ YYZ in April. It seems great especially when those lines in the morning (Monday AM @ YYZ is > 1 hour) can really save you. For 50 CAD its a no brainer.
My BF just got it, and said it worked great the last time he came to the US. I'll have it soon!!!!
I guess I'll sign up for GE when I get my final approval for Nexus.