I have a mid 2009 Macbook Unibody running Traktor 2.5.1 with an Audio 8 and I had to use the beta driver. Using old drivers resulted in unusable output, sounding a bit like a very distorted flanger. I had no issues with the beta driver (played around 3 hours with it) and couldn't notice any differences regarding sound quality and latency. Hope this helps!
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