My take on having straight and level nock travel is that if your bow dosen't have it and you are happy with your accuracy, you're probably not alone!! I've ownde several Dartons and I didn't find them to be more accurate that anyother bow that I've ever owned. Actually I can shoot just about any bow with the same degree of accuracy, it all boils down to getting and holding the sight pin on target and getting the shot off at that moment when it's still. If I can do that everytime, I'll be shooting 3 inch groups at 80 yards depending VERY much on the wind conditions. The biggest thing to worry about is where the point of the arrow is at the shot, the fletching will follow and straighten the back end out for you. I've had trouble with a drop away rest because of not enough support duration before enough momentum was achieved before the arrow left the bow. I don't believe the arrow needs a "guide" all the way to the fletching. After a certain point, the rest launcher is just in the way and shouldn't have any influence on the shaft. To sum up my thoughts on advertised straight and level nock travel, it's just another thing to advertise about.