Hard cover case for my Samsung Reality?

Does anyone have any experience with Rocketfish mobile hard cover case? I was looking at buying a hard cover case for my Samsung Reality and found it at Best Buy for $19.99 through a discount deal available at [removed spam link] I have never used such cell phone stuff so need your advice before getting into anything. Is it worth to spend so much money on a phone case? If you know any place where I can buy good quality hard cover case at lowest price, please let me know.

Thanks..

[edited to remove spam link]