I throw in what i like to call a GVT hybrid from time to time to change things up. I do 10x10 w/60 second rest in between sets. I pick one compound movement, sometimes two, out of my routine such as assisted pull-ups, squats, flat bench press, etc. and do it GVT style. The other movements in my routine stay the same. Shit's brutal. Always leaves me with nasty DOMS for several days after.