I don't like Gates on the M/B either. The Gates belts seem to be close in size to the metric equivalent.........and they sit a bit deeper in the groove.........thereby requiring more tension on the belt.

The Continentals fit perfectly and will probably last 100K miles........especially if you do not overtighten them.

It's quite amazing how little tension is required for the accessories. I've got well over 5/8" of movement in the center of the alternator and p/s belts.........no issues with transmittal of torque.