I got a KMC X10SL chain of ebay recently, and finally got the correct Missing Link to put it together. My DA chain had about 3K miles on it and had stretched a little, so I was worried that the cassette cogs might have been affected. Turns out it wasn't a problem. I guess I replaced it in time. The good news is that the KMC chain is: Light weight, totally silent, and shifts perfectly smooth. As for durability - we'll see.