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I haven't used the WinterContact 830's but I loved the 780's on my E39. I know that won't tell you much because they are different tires, but histoircally it's been a strong performance winter tire and I like the trade-off they make between performance and hard-core winter. They did wear fast, however.
Continental appears to be releasing a WinterContact 850. (?) What few reviews I've seen have been very positive. The Michelin Pilot Alpin 4 PA4's also seem to be high on most reviewers' lists.
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