I found putting an sts on my bow to be one of the most postive peices of equipment I have ever spent money on I found no speed loss.Just qweited the bow down and lost all hand shock in turn I shoot better.But maybe this is not the case with all bows but a bow is a bow and are all basicly the same.I guess for me any bow I buy from now on will get an sts I can t see how it could cause any negative effects since the arrow should have left the string by the time it starts to do its job.Would be nice to see some high speed film of one must be somwhere out there. thanks David