I've had one for years.If you are willing to follow the rules,keep the bound book as required,yes they're worth the $30 dollars.Many outfits like Midway,Grafs,Brownells give you a licensee discount that can save you that $30 license fee the first order.Not having to go through an FFL can pay for it on one gun but be aware of what the license covers and what it doesn't.It's not a license to buy and sell on a large scale and you are subject to inspection although I have never been and don't know personally of anyone who has of my friends who have one.Follow the rules,no problems.Comes in handy at gun shows in states where waiting periods and dealer transfers are required.Be aware also that some dealers will not accept them,especially on the auction sites,that's their perogitive their store.Check and make sure the seller will accept it before buying to avoid hassles and unexpected costs and disappointment.