I too was skeptical, but was prepared to take the risk.
I have used a Speck case for a year, which was heavily abused. So needed a replacement, and as Speck do not make one my size anymore 11" Air, I chose this.
To fit it is the same as the Speck, gently feel it into place, as it is a snug fit, don't just force it, take a little time over it.
When opening the lid the case catches at the 90 degree position, and has to be gently pushed fully open, I think the case will ware into after a bit of use and be fine. This is caused by the back edge of the bottom part being just a fraction to thick.
I chose the blue colour and it is wonderful, as the aluminium body makes the blue a metalically blue.
The packaging was very poor, and it could easily have been damaged in transit, and delivery was not adequate, but not fast, they have to make savings somewhere to be able to do this price.
I'm glad I found this.