What do you guys feel the role is in GPP training as it relates to powerlifting?

On the one hand it can be a huge drain on the body if over done.

Do those of you who incorporate it into your training feel you can train at a faster or more productive rate than without it?

In the spring, summer and early fall I often use some form of GPP but it's more because I'm working out with my athletes rather than really trying to benefit my PL training.