I have both the xenons and the HK in my X1. IMO, the adaptive feature makes the xenons a must. I've been in too many situations (even in the city) without it in a previous vehicle and wish I did have it. I must admit the HK option is a personal choice. My wife's X3 has the standard stereo and she likes it just fine. I like the HK in my X1 as it sounds clearer and brighter. I don't get hung up on the technicalities of one system versus the other.
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