I was wondering, if I were to get the Skinomi TechSkin or the ZAGG invisibleSHIELD, do I still need to buy a case? I was thinking of buying the Skinomi TechSkin for my Droid X but I'm thinking of buying a silicone cover for it too. Is that too much? Is the Skinomi TechSkin enough to keep it in pristine condition and was the TechSkin made to be a "new" type of case? Thank you! PS - Are Skinomi product's quality good?