Yea, I have heard noting but good things about displex as well. You can pick it up on eBay for around $10.
The screenguardz look cool, but I think I would have to custom order them. Does anyone know the size of the screen in mm of the 7520?
After reading more carefully, I do not know if screenguardz are for our BBs or not;
Please note: ScreenGuardz adhere to a device with static and will not adhere unless the device screen is a TFT type screen (Looks like glass). Most PDA's, phones and digital camera's use this type of screen. Video camera's and laptops do not and the protectors will not adhere.