I think you should go for it! It's what I would do in your shoes. I had SAS issues with my wife's e83 when we bought it used. At the time, FCPEuro had OE steering sensors (BMW logo filed off) for closer to $200 IIRC. At over $300 now for a genuine sensor, I'd take the chance on the repair kit. There aren't a lot of parts inside the sensor to go bad.

Also, if you change your mind and get a new sensor, keep in mind it must be "coded" to your particular vehicle. I was able to code mine using Progman.

AM.

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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)