For this review, I tested The Frame with a GoPro Hero 3+ Black Edition.
The principle benefit and raison d'etre of The Frame over other GoPro housings is audio. The Frame offers the best audio of all the GoPro mounts in terms of gain and clarity, which my testing confirmed. Although the difference in audio volume between The Frame and the new GoPro Hero3+ Skeleton Housing, was small, it's clearly measurable and the clarity is definitely noticeable in playback.
The newest incarnation of "The Frame" has some very welcome improvements over the earlier model, especially from the engineering side. This model has a latch at the top which snaps very firmly closed, securely locking the GoPro camera in place. Mesh sound ports over the top and side microphones allow the fullest audio capture. The wifi and record buttons are rubberized and flat along the Frame's exterior. For users with either the battery or LCD backpacks, a metal bracket rotates out, holding the backpack in place. For those without, The Frame comes with a port cover that ships in the top box of the package (don't throw away the packaging until you have located it!) to keep dust out. It also comes with a lens cover - a very welcome improvement indeed - that slides very easily and snugly over the camera lens to protect it from scratches.
The Frame permits access to the USB, HDMI, and memory card ports. For longer recordings like interviews, The Frame is great for capturing audio, and can be run from an external power source so you aren't changing batteries as often. The downside is that the USB is also the mic port, so you have to choose between external power, and microphone. Although the memory card is accessible, the spring that ejects it from the camera is intentionally weak, and I've had to resort to tweezers to remove the card completely. If you have smaller fingers, this may not be a problem for you.
Overall, The Frame is a great mount to include in your GoPro arsenal. It has very specific uses, but there is simply nothing else available that can do its job. Recommended.