Yes, my wife has a Defender and it's nice but not in the same class as either the Survivor or Armor. It isn't water, dust or crush proof. So if any of those things are on your must list, the Defender is out. I got my Armor case and so far, am really impressed. It is definitely heavier than the Griffin, and it is a bit bulkier but not significantly so. I like the closures on it, they feel more robust than those on the Survivor, and the phone is definitely protected. The sound is a bit muffled with the bottom sealed, but personally I almost always listen to mine either through headphones, in which case you will have the top jack closure opened, or through Bluetooth external speaker which will not be affected. I believe the cost of the Lifeproof is a bit cheaper than the new Armor (which is $99) but from the people I know who have a Lifeproof and the cases I have been able to handle as a third party, the Armor is easy more robust and protective. The Lifeproof us slimmer, but it also feels cheaper and, I would wager, not as protective. Just depends on how much protection you want and how much weight and bulk you are willing to take to get it.