After trying a couple of different cases out for my iPhone (original), I settled on using an Agent 18 case and a screen protector. I've probably been using them for 7 or 8 months and I'm happy with them. But, I'm working in an extremely dusty environment this summer (rock dust from drilling) and I've found that the case traps a tremendous amount of dust. Cleaning it every day would be a pain, so I'm thinking it may be best to go without a case while I'm at work, unless anyone has any suggestions for a case that will keep the dust out. Thanks!