My 4.8 has the OEM net and built-in attachment points.
Last weekend I used the net in the rear position (dogs on board) but haven't yet tried it the forward location. It's certainly not as user friendly as my E39 Touring net installation, which was an excellent system.

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Current:
2004 X5 4.8is - Le Mans blue/Cream beige
1994 E31 850CSi - Sterlingsilber

Previous:
1987 BMW E28 M5 - Delphin-metallic
1976 BMW E3 3.0Si - Arctic-metallic