The original factory-assembled Transroc Rocketronics from Estes usually fetch high bids the few times they come up on eBay which is really rare; FAR rarer than Cinerocs, K-29 1/70 Saturn 1B's, and Centuri 1/45 Little Joe II's.
I remember seeing originals on eBay maybe 3 times in the last 5 years.

The Transroc II trackers that Estes offered in either the late 90's or early 2000's are genuine junk.
Avoid like the plague.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !