If we actually saw some engineering data, it would be much easier to understand the problem. Up until now, all I've seen are opinions and we all know how reliable opinions are and who has them. Even Darton's website info, although interesting, qualifies as nothing but a sales pitch. Unbiased engineering data would be a great start, but even then, one has to judge the validity of any concern, by real life experiences. If I was having tons of trouble tuning broadheads out of today's single cams, I'd be a lot more likely to think there was a significant advantage to one cam style over another. However, I'm not experiencing such problems. I'm willing to bet, that some day a technical report from an independent test on the importance of S&LNT will emerge and then we can all form our opinions on data, rather than on someone else's opinion.