The SS-NX-28 never worked, hence the Borei-class submarines had to get completely redesigned missiles. The SS-NX-28 (Russian designation: R-39M was based on the SS-N-20 Sturgeon (the baseline R-39) used in the Typhoon class. The SS-N-20 was already plagued by problems with their solid-fuel boost engines. Over half of the early flights failed. The Soviets seem to have ironed out most of these problems.
Although, I assume they didn't get rid of all issues, which might have been part of why they only bought six Typhoons and never ordered more than seven. Of course, these beasts were also extremely expensive given their enormous size.
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Liber et infractus
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