Tried it a bit for leg training during a week or two off with a quadratus lumborum (lower back) strain: step-ups, leg extension/curl supersets, even tried occluded hill walking. Coming back to squats without any strength loss, so it seems quite good. I also use it on upper body accessory work occasionally if I feel like I need the break from heavy weight.
My goal is strength (powerlifting) and I don't do much assistance, but my arms look a bit bigger since doing occluded curls once or twice a week.
I know John Meadows uses it (have a look in his forum/section) and I'd imagine it would be great for bodybuilding alongside normal heavy lifts. A major benefit is the lack of soreness afterwards.