Just got my case today. And it's now stuck on my phone, haha. I seriously can't get it off.
As for the case.. it seemed EXTREMELY cheap at first glance, when I took it out of the package. Like the last person said, the finish is not very good. The edges where the front and back pieces meet just don't fit together very well and they are not smooth.
When the case is on the phone, it improves a lot. It has the hard satin finish, which is nice. The front and back pieces aren't the same shade of green which is really irritating to me.
Overall, it's a decent case for free, but I definitely wouldn't pay for it.
This is the case I got:
http://www.luxmo.com/p-1593-apple-iphone-4-crystal-rubberized-case-green.aspx
The green in the picture is very different from both greens on the actual case.