I have an opportunity to buy a PSE LD2400 Infinity and am wondering how long this model was produced, have there been any problems with this model, any comments in general on this bow. Also, the label on the bow states minimum arrow weight of 360 grains with 60# pull. What is the purpose of this minimum weight? To protect the bow, or the arrow, or some other reason? What would happen if a lighter arrow is used at a reduced pull weight?