Madshrimps posted a review on the OWC DIY Kit (Data Doubler + SSD) and SuperSlim USB 2.0 External Enclosure

The OWC DIY Kit is compatible with the latest Mid-2012 non-Retina Macbook Pros and helps us install an additional disk drive by replacing the Apple SuperDrive. The kit also incorporates a high-performance SSD from the same manufacturer (SandForce powered) and for $39.99 extra we can also have the Super Slim USB 2.0 Enclosure for the removed SuperDrive.

  OWC DIY Kit (Data Doubler + SSD) and SuperSlim USB 2.0 External Enclosure Review