Unfortunately, I did not check this (and other) site before ordering from this vendor. All the reviews are awful.
On 2/3/11 I ordered a case for my new iPhone 4. I found another case that was more to my liking. On 2/5/11 I emailed cases4u.com requesting that they cancel my order and refund the payment from PayPal that they had received. They replied that the order had already shipped so they couldn't change the order. They supplied a tracking number.
I checked the USPS site and there was no information about receiving electronic information, or receiving the package. I tried the Hong Kong postal site (on the recommendation of the vendor). The HK site only tracks Speedpost Air Mail, not Standard Air Mail - which is how the vendor ships. They well know that there is no information on the HK site, but this was the first of many deceptive behaviors on their part.
As mentioned, they state that the item had shipped by 2/5/11. In fact, according to the USPS site, the package was not received at HK postal until 2/17/11! So, first they lied about shipping by 2/5/11. Then they lied about not being able to cancel the order because it already shipped - they had TWELVE DAYS to cancel the order. (To say nothing about taking two weeks to ship when they say they will ship in a few days.)
I wrote multiple emails, which took days to answer until I threatened to contact Paypal and open a dispute. Emails were then answered with alacrity. However, the emails never addressed the issues or questions - they just kept repeating that I could check HK postal and gave the tracking number. After repeated emails, they did respond to my question about their Return Policy. I should have had my suspicions aroused when I noted that there was no Return Policy on their site. There is a good reason for this - essentially they have no return policy! They said that you can only return an item if it is "damaged during shipping". Other reviewers have note that they insist on pictures of the damage, and still deny a refund. In short - ONCE YOU ORDER IT, YOU OWN IT! Too bad if you don't like the item, or it's damaged, or it doesn't fit your phone correctly.
I cannot suggest strongly enough - DO NOT DO BUSINESS WITH THIS SITE. There are plenty of other places to buy your phone case.