I have the Yakima Rail Grab for another car that I test fit to the X1 and it works fine. The newer aero bars will be quieter than the old round or square bars, especially since it's hard to run a fairing on the X1 with a sunroof.
The OE BMW stuff is made by Thule though, and many accessories will fit either. I just have more stuff that works with Yak round bars, so stick with it.
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