Versatile Monitor Controller
I own three of these - for my video editing workstation, my composition station, and another for live music. Using the digital optical output of the Mac allows you to eliminate grounding problems and benefit from the device's re-clocking/jitter reduction. To interface with higher end audio interfaces with AES/EBU, Hosa makes an AES/EBU to toslink converter that works well.
For video editing:
Provides crystal clear output to my near field speakers and the ability to cut, dim (loud b-roll) and set a reference mix level is amazing. When leveling my dialogue, I can always use the reference level to make sure the whole piece is consistent without worrying where the monitor knob was last set. When my producer starts gabbing on the phone, I can quickly cut the speakers and pickup on the headphones which also have a separate reference level setting. Overall, a solid value with great clarity.
For music/sound mixing:
The same features outlined above are incredibly useful for mixing. The small size of the controller makes it a great way to interface with your big clunky rack mounted audio interface. It fits nicely on my crowded desk. The D/A conversion is stellar and provides a wide stereo soundstage to work with.
As a Direct Box:
I play keys in band using MainStage as my sound module.Connected to my Macbook Pro's digital output, I use the BMC-2's XLR outputs to feed my keyboard amp/PA and then use the headphone output as an additional output for my in-ear monitoring system. It ensures the sound guy is getting a high quality, hum-free signal without having an external sound card to worry about. Also, when I need to "goose" my lead sounds, its nice to have a big fat monitor knob to do so - the level control makes this better than using a traditional direct box.
Used almost everyday for over 2 years, none of the controllers have had any issues.