[nine_k]

I frankly would care little about the speed; it can always be improved with a better propellant. I would care about a cheap ability to guide the rocket. If it's there, it may be consequential for a real (para)military application.

(A quadcopter is perfectly guidable, but it must be slower than a rocket, and costs more than $96.)

[giantg2]

Guidance systems have speed limitations. Just because it works when slow does not mean it will work if you upgrade propellant.