Definitely not worth the extra coin, hassle of installation set-up, and waste of time, if you believe that there will be any power gain in buying and using this product. There was no noticeable power difference as claimed. No extra-crisp throttle response. No extra RPM advantage. The undamaged stock reeds actually worked better - or at the least - just as well, as these Boyesen 620 Reeds. The worst part is - that re-jetting of carburetor is necessary, as per instructions. What a pain just to discover that there is no difference in the end result. Engine runs great with these reeds - but it also runs great on the 20 year old stock reeds. WHATEVER! Two-piece design appears cheaply made. Product should be made in China where price would be significantly lower and quality might improve.Returned this item for a set of stock stainless reeds through Yamaha for my DT-50.