I dunno, I see the good side of them as they are a more full body movement and can whip you in shape. However, I do standard pullups as it targets the back/biceps/shoulders more directly.
Crossfit = better overall conditioning
Standard = better for body building.
I do want to start implementing more cross-fit or HIT exercises in my routine though as I believe there is a huge difference between looking fit and actually being fit.
You probably aren't on the same page though because powerlifting is entirely different.