Dbarrm,
Loopy is right. The aerotech and Dr. Rocket are the same thing. I have the Aerotech 38/240-480 set, the Dr. Rocket38/ 720 motor and the Dr. Rocket 29/ 180-240 set in millinium Blue(real pretty)
Actually the Dr. Rocket casings are usually cheaper, and they are ingraved with the casing number where as the Aerotech cases have a sticker with the casing info, which over time fades, or can come off. Both are good quality. Just my .02
Larry