I've been out riding the HiFi pretty hard for the past three weeks since I picked it up. I noticed that I was having some issues trying to shift into the 9th gear. I took it back into the shop and left it for them to work on. The LBS calls me up the next day and said they were having problems fixing the issues with the derailleur. The called SRAM to ask some questions and SRAM said they were possibly having some type of design issues with the X9 and that they would ship me a free X0. They said there is no official recall or anything and they were just dealing with the issue as it came up.
If anyone else is having this problem, you may want to get your LBS to check on a possible upgrade.
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