Installation is quite simple: Unscrew foot (then the frame below "open"), turn / squirm on the camera until the GoPro is stuck on the sides, then screw on foot again. As long-term fit thats still has to prove, you have the frames but sometimes bad turn in order to get the Hero in or out, in particular in the variant with BacPac. Thanks to the protective cap can be the GoPro as well as times get stuck in your pocket without ruining the look. Otherwise, this assembly has naturally no serious protection against damage by dropping, humidity etc. - but is not the intention and should already be clear to everyone in front of purchase.
For car or (indoor) stand is a "frame" the absolutely most compact installation option; the frames are made of ca 1mm thick plastic, each with space for the USB port (for connecting the power supply or external mic), and soft rubber inserts for the pushbuttons and LEDs. The narrower scope covers on the back of the camera and the contact strip for the BacPacs. The port of the optional battery BacPacs is generally not accessible; when, however, focuses on value, even in these (wider) frame mounted charge, either hopeful waiting for a firmware update or unauthorized modification example is asked with a Dremel. Subsequent plugging of BacPacs to the Hero in the narrow framework, however, is not possible even if you remove the cover as well as the edges were drawn around the housing around easily.
So far I have used the frame only in the car, and here he is perfect. Everything is stuck, power supply via the vehicle power supply via 12V USB adapter and cable is not a problem, and in particular when using the remote control or the camera app you can now tightest corners mount (eg behind the rearview mirror). The ventilation / heat dissipation is well under the circumstances, since the front and back sides are completely free.
The downer is like all GoPro Stuff unfortunately again the price is certainly a high accuracy of fit can only be achieved with a certain effort, but one wonders still why you should shell out this amount of money for Felt five grams of plastic. Therefore, a star price deduction.