Fixed pitch models are good for beginners because...
* They are harder to fly, so you learn quicker.
* You have to think ahead of the model, which builds good skills.
* They tend to have lower head speed so are less likely to damage things they hit.
* They tend to be stronger and take less damage in crashes.
* They are usually cheaper so you don't mind taking risks as much.
But the smaller the heli, the quicker you need to be to fly it... As a general rule.
I have a couple of Walkera 4's. Nice to fly. The collective pitch models have better collective response though. Especially vertically. And when you drop off head RPM to fly or descend, control suffers.
But I still fly my Walkera 4's outside at least once a week. More if it's light when I wake
David