S300 is 130bcd (I think) and theoretically have slimmer chainring mounts so would have more chance at working than Omnium.
Dolan need a more comprehensive warning though - They should really test all of the popular chainsets. They also sell DD75 - What's the betting they don't work either?
Would S300 fit the new Pre Cursa, or would it be the same due to the GXP BB?