Cover for the MacBook is easily lost.

I have a MacBook Pro early 2011, and wanted to protect my connections.
The quality of the silicone plugs are fine. Unfortunately, the covers are easily lost. Above all, the plug of the microphone and headphone connections are lost come to me first. The fit could be a bit better. You are minimal too large, so that the plug always jump back out. Yes, I know what you're thinking and you're right. The plug must be slightly bigger so that they lock properly. But you would have to install a small groove in the plug, so they can not jump out too easily. To me already missing 4erlei plug and I have to willy-nilly come up with something else.

Conclusion: For 4 acceptable.