Yes I had the opportunity to work with three of them... they cost like 4.2K each one, efficient binary protocol, gyros, accelerometers, GPS, magnetometer and barometer inside, uBlox is inside as well (I opened one) ... Pretty damn good! Blackfin microcontroller.
Price is 3kUSD indeed. Used them for my research couple years ago. Had issues with the integrated GPS, so we transplanted a custom module with integrated antenna. Otherwise, works pretty well. SBG has a very similar product (http://www.sbg-systems.com/).
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it's used on the UAV research projects @ my university...
http://damien.douxchamps.net/research/imu/