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Volvo have been using Haldex for more than 15 years on their AWD models - probably ever since they switched from RWD to FWD in the 90s. All their current AWD models use the "Gen 5" system. As r999 says. the real advantage is that for the vast majority of the time most work is being done by the front wheels alone and so you gain the fuel economy advantage that this gives, while still having AWD traction when needed. From Volvo forums over the years I've gathered the AWD system is considered very useful in snow and ice (something we don't have a lot of in Australia). From about Generation 3 onwards, the Haldex system has been very reliable for Volvo.
Before I switched to BMW with my current X3 we came from a Volvo background with 2 of our last 3 Volvos being AWD.
Tony
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