I have been looking for a case since I got my iPhone 4 back in November and I can't belive I have neglected this.
For starers, the case is so smooth from the outside it is so easy for you to slide it in and out of your pocket, unlike some silcon ones, which sticks and you miss a call by the time you answer the phone (it's happenend). Inside the case, the material is a soft velvety feel, making it so smooth for the back of the i4 to enter without fear of scratching it. The antenna issue has been solved and no matter how tight you hold the phone the signal may drop one bar, but it will NEVER disconnect the phone.
The most important factor, it protects, I haven't dropped my iPhone 4 since I got it, and then freak accident, luckly had the case on and dropped on marble surface it has protected it so well.
Its amazing! FULL STOP.. I could go on for hours, but I can't stress how I highly recommend this product. Ok, it may be little expensive, but is it a price to pay for a device like the iPhone which any drop and boom you pay for the price of not having the case.
BUY IT.. BUY IT.. BUY IT