Haven't heard much about it, but looks interesting. Appears to be a true plug and play for E60, E82, and E9x (at least from a speaker replacement perspective).
Looking toward the end of the page at
http://www.gladen.com/compo_coax.html...
- Plug & Play 3-way System for BMW 1, 3 and 5 series
- Semi-active System
- 25 mm silk dome tweeter
- 4” shallow midrange
- 8” shallow woofer
- 4 ohm impedance
- 4 channel amplifier required
Some additional information is available at
http://www.highdesertme.com/?p=704