Nathan Websterwrote a review of Shimano XTR 9-Speed Chain on May 12, 2009
This is hands down the best 9 speed chain you can buy for your bike. Install it properly (read the directions carefully and use the installation pin) and you will get strength superior to all other 9 speed chains on the market. Yes the SRAM pc-991 hollowpin may be a little lighter, but it has nowhere near the strength, durability, or smooth shifting of the 7701. I would get 4 months tops out of a 991 (with several broken powerlinks during those months) while I get almost a full year out of the 7701 with no broken links. I will never run anything else.