- Nokia BH-905 bluetooth headset with active noice cancilation. - JVC KD-BT11 bluetooth carstereo. Sadly it doesn't perform well. It's definetly a N900 issue. I've extensively tested the headset against another phone and my laptop and there it performs well. Reasons it's not performing well: - under load music speed ups and slow downs are noticeable - choppy sound when it's set to automatically pick it's best datanetwork - choppy sound when it's set manual as well (when the data network (3g/2g) is flaky and switching between those 2 types) - Bluetooth stack will crash my headset when caller and receiver simultaniously disconnect a phone call. - Bluetooth connection with the KD-BT11 will often hang the phone application in a freeze state when there's a long time of no communication between the devices while being paired. - Bluetooth connection with the KD-BT11 may seem ok and when the phone rings and gets answered, it will not forward any audio (incoming and outgoing). This can't be fixed, but you're able to switch from headset to internal speaker and all will function properly. need any other noticable bugs?