I used both.
The quality is very good.
But the handling is why I love these boxes.
With the tone-generator you can quickly setup your rec-level in camera.
You have good limiters preventing digital clipping caused by sudden high-level sounds.
The meters are big and bright enough that I can put the box in the corner of my
field of sight, and still see what happens on the audio part.
So the chance, that you get your audio right, is raised a lot.
I had to try it out to understand, what it does for me.
I´m an audio guy btw.
The mix-pre has a tripod-mount on the bottom, and a camera top mount as an accessories.
I´m still waiting for my BMCC, so I only can guess how it will sound together.
But usually in-camera line level recordings are no problem.
hth
klaus