About a year ago I installed a DID 520 ERV7 chain on my 07 blade with new driven steel sprockets. I have 13,000 miles on it now and it finally needs to be replaced. It was a good chain in terms of wear; it hasn’t required adjustment literally at all since new. I clean and lube it every 600 miles, and when I say clean I mean spotless, not a spec of dirt remains. Cleaner than a catholic school girl. I take my time with a soft bristle tooth brush and maxima cleaner and then spray the emulsified crud off with hot water in a spray bottle. This is followed by a thorough drying and maxima water displacing MPPL followed by pro Honda lube with moly. At 13k it’s developed a stiff link that feels kind of crunchy when hot and I think I know why. Early on (2k-3k miles) this chain started shredding up X rings. Not completely ripped in half, but if you can imagine one arm of an X tearing off, that’s what started happening. By now there are probably 30+ compromised X-rings. So I’m guessing the link in question lost all its grease and/or got contaminated. Mind you, these 13k miles are a culmination of several trackdays, hard canyon, and high speed crash test goat style freeway runs, so 13k isn’t bad. However if the X rings stayed in tact I bet I could have gone 15-20k on it. I ordered a new chain and sprocket kit, still 520 but going back to stock gearing, and I went with an RK GXW chain. I wanted to go with the EK ThreeD but sprocket center was out of stock. I figured the more robust XW rings on the RK chain might keep it sealed longer than the DID. I’ll update in a few thousand miles and let y’all know how I like it.