yes it is ok. Most of us have to make due with clones as the original are only affordable by the few.

And unfortunately for most of us, that is us.

with that said......UpScales of some of their old classics like an X-Ray suitable for F engines I think would be cool. Why manufacture EF engines if you offer only a very few models capable of using the EF ?

My X-Ray Story:

One of my first model rockets was an X-Ray. Why ? to stick bugs inside the clear plastic payload section and see if they survived or not.

One night some friend and I decided to tape together a light bulb with a couple of batteries, placed it the clear payload section and launched it at night, figuring with the light we would be able to track it as it came down. Wrong. The acceleration loosened the tape job and the light went out. Oh well... back to the drawing board.... Hey I was 13.....give me a break...

Needless to say I never did find that rocket again.

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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.