Try it out and see how you like it. I think it suits your needs perfectly. A 9 speed would probably be enough and a little cheaper than a 12 or 18 speed.
It's a lot of money to just "try out" a pinion.
But I am leaning that way
No bike shops in your area to take a spin on ? I wouldn't buy it blind.
@Grumpy_Git started
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Try it out and see how you like it. I think it suits your needs perfectly. A 9 speed would probably be enough and a little cheaper than a 12 or 18 speed.