i've heard this on another forum and they posted the chat with seidio about it... i love seidio cases, but i wouldn't use the evo case, at least not until they redesign it. i think i'll just get the sili case for when i need more protection. i'll try and find the post.
edit: OP, please see this. seidio will replace it with a new case with special rubber coating. don't know if you can do anything about the scratches already there though :/
http://forum.ppcgeeks.com/showthread.php?t=126047