These are great motors! I am 45 years old. I have been flying rockets since I was 7. I am level 2 certified with TRA. And they say you save money with these. Yoou really save about 90 cents. But I wish these had been around when I was young. For one You do save a lot of money but in another way. Thses motors because they are not assembled. They can be sent usps without a 20.00 Hazmat fee. But the greates thing about them that is priceless. Is if you are just getting into higher power rocketry. Eventually when you wish to go above the letter G. You have no choice but to use RMS. Motors that you reload the grains into a reuseable case. These motors you are doing the same thing. And learning how your motors look inside and how they go together. This makes it so much easier when you have to make the transaction to RMS motors. So I highly recomend these to anyone. Just to even gain the knowledge of how your motor does work.
