I do not want to upset any sponsers to a great forum such as x5world, but the biggest change in the ULFs you mention is Voice Quality. The first Generation ULF module uses an old DSP to process the handsfree voice audio and mic, while the newer incorporate a new DSP for drastically improved audio. You don't take my word for it, but contact, the Visteon Bluetooth Product Manager on the Visteon Mach Voicelink product for details..... His contact information is in my hands right now, but I think I will hold back to save him from calling me to bitch me out for telling everyone to call him....

Anyway here is some general information http://www.visteon.com/products/auto...oicelink.shtml

Martin