I run the Motul in my race bikes - definitely like that stuff. Plus it's kind of florescent green which is cool

On the S1, I've stuck with the Castrol Racing and buy it online by the case. The only reason I'm doing that is just to cover my bases on the warranty side. I'm not hard over on all warranty stuff (I'm running a full exhaust, PCV, etc.) but w/the engine oil, if I end up with an internal issue on the engine and they see green oil - who knows where that would lead. As soon as my warranty runs out, I'm changing that bike over to Motul as well.
Don't know anything about the Repsol oil.