Astroscan for planet viewing

Recognizing that the Astroscan is not best suited for view planets,
what can I expect to get from one?

I have read that its design limits it to about 100x magnification.
Why? Does this include the effect of a Barlow lens? What could I
expect from a 4-8mm eyepiece, alone and in combination with the
Barlow?

I am not looking for someone to tell me that my child's Astroscan
won't do the job- I already know that it does what it is supposed to.
What I am looking for is someone who can give me an explanation of the
telescope's limitations, the design compromises that cause the
limitations and what happens when you push the design limits.

Thanks,
JP