cygnett grooveshield case iPhone

has anyone used this case - i really like the look of it but i am not sure if it will scratch my case when putting it on and taking it off.
http://crave.cnet.co.uk/mobiles/0,39029453,49298573,00.htm
I currently keep my iPhone in a Moshi case which i love but feel i need something to protect the phone a bit more. I wanted to use an invisibleshield with the Moshi but made a total mess of putting shield on!!!!!!!
http://www.easyishop.co.uk/product.php/230101386/0/moshi_ipouch_for_iphone__ipod_touch___classic__pink_
If no one likes the cygnett what else can you recommend that is not too bulky, will not scratch my iPhone and will not let grit and dirt get under the case!!!
30GB video, 8 gb nano, 16gb iTouch, 3G iPhone Windows 2000