Fits sleekly, provides traction, completely protects the exterior shell, and slightly buffers the sharp edges of the front/top (My only problem with 'Air'). But; It illuminates around the screen edges because of the lit Apple logo in the back. It also weighs down the top a little so it'll go back/forward making sometimes difficult to hold a position. These are more-so problems with the 'Air' than Moshi's product. All in all, I'd suggest it and it's definitely needed, unless you'll never move your MacBook.
When I a little dent into my new air when my phone fell onto it, I decided it was time for a hard case. After doing a lot of research and seeing the common problem of shells breaking very easily, I picked this Moshi in pearl white, based on reviews indicating that it was a bit more sturdy than others.
Pros: sturdy-doesn't feel like it will break too easily and makes my computer feel much more durable. Color- more opaque than expected but still looks quite nice. And I also appreciate that it is totally smooth along the bottom (where your wrists are when you are typing). Super easy to put on, and seemingly easy to take off.
Con: When the case is on design doesnt allow the screen to open very far. I think I will find this quite annoying considering that Im more often than not using my computer in settings other than a standard desk/table (But, I would think this is a common problem with most cases)
Overall the pros outweigh the con and I think that of the options out there this is a great choice.