I have two Blade CX's, been flying them since January. I fly everyday, indoors mostly, and outdoors when the wind allows. I serioulsy don't believe the speed of the blades, regardless of your flying habits can cause the blades to break. I've broken my share of them, but only after hitting my table, workbench, trees, etc. Just make sure when you put on new blades, they are tracking okay and make sure the screws are tight.