I just contacted them because the screen protectors that came with my Commuter cases worked well for me, and I was looking to buy some replacements. I couldn't find a way to buy them on their site. I also mentioned that something had gotten under the built in screen protector on my Defender making a small blemish. I sent them the email last night, and by 10 am, I had gotten a response from them. He immediately sent me 4 replacement screen protectors as well as a replacement Defender case. He said there is no need to send my Defender back, and just keep it as a backup.
Honestly, I was shocked at how great their customer service was. That is what gets repeat customers. Great quality and great service.