With nearly everyone asking for wireless feeds from the sound mixer to camera, it's nice to know that I have the ability to add a back-up recording to any package, even on location and at the last minute.
But the 633 is so much more than a mixer with a backup recorder. With the ability to record up to 10 individual tracks (6 inputs, 2 L/R main mix, and 2 aux busses) you can give your post-production team the ultimate in flexibility by giving them not just the Left/Right mix sent to camera, but individual isolated recordings of each input.
Ask about iso recording when you book your next shoot!