Fred
If you fly one indoors it will likely cause a fire - definitely not recommended - these odd rocks pop their chutes at or just below apogee - never had one hit the ground not under chute (except the prototypes which we didn't put in chutes for...) Not like a Snitch or other non-chuted things.
We decided to put parachutes in them to keep the risk of problems low.
Just be smart, follow normal NAR rules for flying - Aerotech rules for motors and use at least an Estes E pad and have fun. Daddy always told me "Don't knock it till u try it..makes u look smarter in the long run.." DOC