Can a high-quality guide pulley truly make a significant difference in pedaling efficiency and chain wear, or is it just a minor tweak thats only noticeable to enthusiasts with highly tuned ears? Specifically, Im wondering if the benefits of upgrading to a premium guide pulley are more pronounced in certain riding conditions, such as muddy or hilly terrain, or if theyre equally apparent on smooth, flat roads. Furthermore, do the advantages of a high-end guide pulley justify the added cost, or are there other components that offer more bang for the buck?