People often talk about the dropper post being the best upgrade to their bike. Dropper is great.... but when I put Zelvy hoops on my Blur LTc 3 years back it made it so much more lively and playful. I didnt save a heap of weigĥt over the crossmax wheels it replaced but the weight that was saved was rotational and going to King hubs and wider rims also made for greater reliability.  I just traded up to a new Slayer and that will be getting the carbon treatment also. I think it is one of those things that you just need to ride it and see for yourself, the positives far outweigh the negatives.